[NFC][lld-macho] Generate test bodies for icf-safe-thunk tests (#111927)

Autogenerate `.ll` code from cpp code in some `-icf-safe-thunk` tests
using `update_test_body.py`

```
PATH=build/bin:$PATH llvm/utils/update_test_body.py lld/test/MachO/icf-safe-thunks.ll lld/test/MachO/icf-safe-thunks-dwarf.ll
```
https://llvm.org/docs/TestingGuide.html#elaborated-tests

I recently became aware of this tool and I wanted to practice using it.
This also allows to remove the custom instructions to generate the `.ll`
code.

Author: ellishg

lld/test/MachO/icf-safe-thunks-dwarf.ll

@@ -1,115 +1,104 @@
+; NOTE: Code has been autogenerated by utils/update_test_body.py
 ; REQUIRES: aarch64
 
-;;; Build the
-; RUN: rm -rf %t; mkdir %t
-; RUN: llc -filetype=obj %s -O3 -o %t/icf-obj-safe-thunks-dwarf.o -enable-machine-outliner=never -mtriple arm64-apple-macos -addrsig
-; RUN: %lld -arch arm64 -lSystem --icf=safe_thunks -dylib -o %t/icf-safe-dwarf.dylib %t/icf-obj-safe-thunks-dwarf.o
+; RUN: rm -rf %t && split-file %s %t
+
+; RUN: llc -filetype=obj %t/a.ll -O3 -o %t/a.o -enable-machine-outliner=never -mtriple arm64-apple-macos -addrsig
+; RUN: %lld -arch arm64 -lSystem --icf=safe_thunks -dylib -o %t/a.dylib %t/a.o
 
 ;;; Check that we generate valid dSYM
-; RUN: dsymutil %t/icf-safe-dwarf.dylib -o %t/icf-safe.dSYM
-; RUN: llvm-dwarfdump --verify %t/icf-safe.dSYM | FileCheck %s --check-prefix=VERIFY-DSYM
+; RUN: dsymutil %t/a.dylib -o %t/a.dSYM
+; RUN: llvm-dwarfdump --verify %t/a.dSYM | FileCheck %s --check-prefix=VERIFY-DSYM
 ; VERIFY-DSYM: No errors.
 
 ;;; Check that we don't generate STABS entries (N_FUN) for ICF'ed function thunks
-; RUN: dsymutil -s %t/icf-safe-dwarf.dylib | FileCheck %s --check-prefix=VERIFY-STABS
+; RUN: dsymutil -s %t/a.dylib | FileCheck %s --check-prefix=VERIFY-STABS
 ; VERIFY-STABS-NOT:  N_FUN{{.*}}_func_B
 ; VERIFY-STABS-NOT:  N_FUN{{.*}}_func_C
 
 ;;; Check that we do generate STABS entries (N_FUN) for non-ICF'ed functions
 ; VERIFY-STABS:  N_FUN{{.*}}_func_A
 ; VERIFY-STABS:  N_FUN{{.*}}_take_func_addr
 
+;--- a.cpp
+#define ATTR __attribute__((noinline)) extern "C"
+typedef unsigned long long ULL;
+
+ATTR int func_A() { return 1; }
+ATTR int func_B() { return 1; }
+ATTR int func_C() { return 1; }
+
+ATTR ULL take_func_addr() {
+    ULL val = 0;
+    val += (ULL)(void*)func_A;
+    val += (ULL)(void*)func_B;
+    val += (ULL)(void*)func_C;
+    return val;
+}
+
+;--- gen
+clang -target arm64-apple-macos11.0 -S -emit-llvm a.cpp -O3 -g -o -
 
-; ModuleID = 'icf-safe-thunks-dwarf.cpp'
-source_filename = "icf-safe-thunks-dwarf.cpp"
+;--- a.ll
+; ModuleID = 'a.cpp'
+source_filename = "a.cpp"
 target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128-Fn32"
 target triple = "arm64-apple-macosx11.0.0"
 
-; Function Attrs: mustprogress noinline nounwind optnone ssp uwtable(sync)
-define i32 @func_A() #0 !dbg !13 {
-entry:
-  ret i32 1
+; Function Attrs: mustprogress nofree noinline norecurse nosync nounwind ssp willreturn memory(none) uwtable(sync)
+define noundef i32 @func_A() #0 !dbg !12 {
+  ret i32 1, !dbg !16
 }
 
-; Function Attrs: mustprogress noinline nounwind optnone ssp uwtable(sync)
-define i32 @func_B() #0 !dbg !18 {
-entry:
-  ret i32 1
+; Function Attrs: mustprogress nofree noinline norecurse nosync nounwind ssp willreturn memory(none) uwtable(sync)
+define noundef i32 @func_B() #0 !dbg !17 {
+  ret i32 1, !dbg !18
 }
 
-; Function Attrs: mustprogress noinline nounwind optnone ssp uwtable(sync)
-define i32 @func_C() #0 !dbg !20 {
-entry:
-  ret i32 1
+; Function Attrs: mustprogress nofree noinline norecurse nosync nounwind ssp willreturn memory(none) uwtable(sync)
+define noundef i32 @func_C() #0 !dbg !19 {
+  ret i32 1, !dbg !20
 }
 
-; Function Attrs: mustprogress noinline nounwind optnone ssp uwtable(sync)
-define i64 @take_func_addr() #0 !dbg !22 {
-entry:
-  %val = alloca i64, align 8
-  store i64 0, ptr %val, align 8
-  %0 = load i64, ptr %val, align 8
-  %add = add i64 %0, ptrtoint (ptr @func_A to i64)
-  store i64 %add, ptr %val, align 8
-  %1 = load i64, ptr %val, align 8
-  %add1 = add i64 %1, ptrtoint (ptr @func_B to i64)
-  store i64 %add1, ptr %val, align 8
-  %2 = load i64, ptr %val, align 8
-  %add2 = add i64 %2, ptrtoint (ptr @func_C to i64)
-  store i64 %add2, ptr %val, align 8
-  %3 = load i64, ptr %val, align 8
-  ret i64 %3
+; Function Attrs: mustprogress nofree noinline norecurse nosync nounwind ssp willreturn memory(none) uwtable(sync)
+define noundef i64 @take_func_addr() local_unnamed_addr #0 !dbg !21 {
+    #dbg_value(i64 0, !25, !DIExpression(), !26)
+    #dbg_value(i64 ptrtoint (ptr @func_A to i64), !25, !DIExpression(), !26)
+    #dbg_value(i64 add (i64 ptrtoint (ptr @func_A to i64), i64 ptrtoint (ptr @func_B to i64)), !25, !DIExpression(), !26)
+    #dbg_value(i64 add (i64 add (i64 ptrtoint (ptr @func_A to i64), i64 ptrtoint (ptr @func_B to i64)), i64 ptrtoint (ptr @func_C to i64)), !25, !DIExpression(), !26)
+  ret i64 add (i64 add (i64 ptrtoint (ptr @func_A to i64), i64 ptrtoint (ptr @func_B to i64)), i64 ptrtoint (ptr @func_C to i64)), !dbg !27
 }
 
-attributes #0 = { noinline nounwind }
+attributes #0 = { mustprogress nofree noinline norecurse nosync nounwind ssp willreturn memory(none) uwtable(sync) "frame-pointer"="non-leaf" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="apple-m1" "target-features"="+aes,+altnzcv,+ccdp,+ccidx,+complxnum,+crc,+dit,+dotprod,+flagm,+fp-armv8,+fp16fml,+fptoint,+fullfp16,+jsconv,+lse,+neon,+pauth,+perfmon,+predres,+ras,+rcpc,+rdm,+sb,+sha2,+sha3,+specrestrict,+ssbs,+v8.1a,+v8.2a,+v8.3a,+v8.4a,+v8a,+zcm,+zcz" }
 
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!6, !7, !8, !9, !10, !11}
-!llvm.ident = !{!12}
 
-!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 20.0.0", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: Apple, sysroot: "/")
-!1 = !DIFile(filename: "icf-safe-thunks-dwarf.cpp", directory: "/tmp/test")
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, retainedTypes: !2, splitDebugInlining: false, nameTableKind: Apple, sysroot: "/")
+!1 = !DIFile(filename: "a.cpp", directory: "/proc/self/cwd")
+!2 = !{!3, !5}
+!3 = !DIDerivedType(tag: DW_TAG_typedef, name: "ULL", file: !1, line: 2, baseType: !4)
+!4 = !DIBasicType(name: "unsigned long long", size: 64, encoding: DW_ATE_unsigned)
+!5 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
 !6 = !{i32 7, !"Dwarf Version", i32 4}
 !7 = !{i32 2, !"Debug Info Version", i32 3}
 !8 = !{i32 1, !"wchar_size", i32 4}
 !9 = !{i32 8, !"PIC Level", i32 2}
 !10 = !{i32 7, !"uwtable", i32 1}
 !11 = !{i32 7, !"frame-pointer", i32 1}
-!12 = !{!"clang version 20.0.0"}
-!13 = distinct !DISubprogram(name: "func_A", scope: !1, file: !1, line: 4, type: !14, scopeLine: 4, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0)
-!14 = !DISubroutineType(types: !15)
-!15 = !{}
-!18 = distinct !DISubprogram(name: "func_B", scope: !1, file: !1, line: 5, type: !14, scopeLine: 5, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0)
-!20 = distinct !DISubprogram(name: "func_C", scope: !1, file: !1, line: 6, type: !14, scopeLine: 6, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0)
-!22 = distinct !DISubprogram(name: "take_func_addr", scope: !1, file: !1, line: 8, type: !14, scopeLine: 8, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0)
-
-
-
-
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-;;;;;;;;;;;;;; Generate the above LLVM IR with the below script ;;;;;;;;;;;;;;;
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-; #!/bin/bash
-; set -ex
-; TOOLCHAIN_BIN="llvm-project/build/Debug/bin"
-;
-; # Create icf-safe-thunks-dwarf.cpp file
-; cat > icf-safe-thunks-dwarf.cpp <<EOF
-; #define ATTR __attribute__((noinline)) extern "C"
-; typedef unsigned long long ULL;
-;
-; ATTR int func_A() { return 1; }
-; ATTR int func_B() { return 1; }
-; ATTR int func_C() { return 1; }
-;
-; ATTR ULL take_func_addr() {
-;     ULL val = 0;
-;     val += (ULL)(void*)func_A;
-;     val += (ULL)(void*)func_B;
-;     val += (ULL)(void*)func_C;
-;     return val;
-; }
-; EOF
-;
-; $TOOLCHAIN_BIN/clang -target arm64-apple-macos11.0 -S -emit-llvm -g \
-;                      icf-safe-thunks-dwarf.cpp
+!12 = distinct !DISubprogram(name: "func_A", scope: !1, file: !1, line: 4, type: !13, scopeLine: 4, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0)
+!13 = !DISubroutineType(types: !14)
+!14 = !{!15}
+!15 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!16 = !DILocation(line: 4, column: 21, scope: !12)
+!17 = distinct !DISubprogram(name: "func_B", scope: !1, file: !1, line: 5, type: !13, scopeLine: 5, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0)
+!18 = !DILocation(line: 5, column: 21, scope: !17)
+!19 = distinct !DISubprogram(name: "func_C", scope: !1, file: !1, line: 6, type: !13, scopeLine: 6, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0)
+!20 = !DILocation(line: 6, column: 21, scope: !19)
+!21 = distinct !DISubprogram(name: "take_func_addr", scope: !1, file: !1, line: 8, type: !22, scopeLine: 8, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !24)
+!22 = !DISubroutineType(types: !23)
+!23 = !{!3}
+!24 = !{!25}
+!25 = !DILocalVariable(name: "val", scope: !21, file: !1, line: 9, type: !3)
+!26 = !DILocation(line: 0, scope: !21)
+!27 = !DILocation(line: 13, column: 5, scope: !21)