Add Flags operand for DebugTypeBasic for NonSemantic spec (#2034)

Flags operand is not optional, fill it with DebugInfoNone value (see #1965
for clarifications why it could not be generated by clang or by LLVM
environment).

Original commit:
KhronosGroup/SPIRV-LLVM-Translator@7a54cde

Author: vmaksimo

llvm-spirv/lib/SPIRV/LLVMToSPIRVDbgTran.cpp

@@ -592,8 +592,11 @@ SPIRVEntry *LLVMToSPIRVDbgTran::transDbgBaseType(const DIBasicType *BT) {
       BM->getDebugInfoEIS() != SPIRVEIS_NonSemantic_Shader_DebugInfo_200)
     EncTag = SPIRVDebug::Unspecified;
   Ops[EncodingIdx] = EncTag;
-  if (isNonSemanticDebugInfo())
+  if (isNonSemanticDebugInfo()) {
     transformToConstant(Ops, {EncodingIdx});
+    // Flags value could not be generated by clang or by LLVM environment.
+    Ops.push_back(getDebugInfoNoneId());
+  }
   return BM->addDebugInfo(SPIRVDebug::TypeBasic, getVoidTy(), Ops);
 }
 

llvm-spirv/test/DebugInfo/DebugInfoTypeBasic.ll

@@ -0,0 +1,61 @@
+; Test checks debug info of basic type is preserved during LLVM IR to spirv
+; and spirv to LLVM IR translation.
+
+; Original .cpp source:
+;  int main() {
+;    return 0;
+;  }
+
+; RUN: llvm-as %s -o %t.bc
+; RUN: llvm-spirv %t.bc -spirv-text -o - | FileCheck %s --check-prefixes=CHECK-SPIRV,CHECK-SPIRV-OCL
+; RUN: llvm-spirv %t.bc -o %t.spv
+; RUN: llvm-spirv -r -emit-opaque-pointers %t.spv -o %t.rev.bc
+; RUN: llvm-dis %t.rev.bc -o %t.rev.ll
+; RUN: FileCheck %s --input-file %t.rev.ll --check-prefix CHECK-LLVM
+
+; RUN: llvm-spirv %t.bc -spirv-text --spirv-debug-info-version=nonsemantic-shader-100 -o - | FileCheck %s --check-prefixes=CHECK-SPIRV,CHECK-SPIRV-NONSEM
+; RUN: llvm-spirv %t.bc --spirv-debug-info-version=nonsemantic-shader-100 -o %t.spv
+; RUN: llvm-spirv -r -emit-opaque-pointers %t.spv -o %t.rev.bc
+; RUN: llvm-dis %t.rev.bc -o %t.rev.ll
+; RUN: FileCheck %s --input-file %t.rev.ll --check-prefix CHECK-LLVM
+
+; CHECK-LLVM: !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+
+; CHECK-SPIRV: String [[#Name:]] "int"
+; CHECK-SPIRV-NONSEM: Constant [[#]] [[#Encoding:]] 4
+; CHECK-SPIRV: Constant [[#]] [[#Size:]] 32
+; CHECK-SPIRV-OCL: DebugTypeBasic [[#Name]] [[#Size]] 4 {{$}}
+; CHECK-SPIRV-NONSEM: [[#Flags:]] [[#]] DebugInfoNone
+; CHECK-SPIRV-NONSEM: DebugTypeBasic [[#Name]] [[#Size]] [[#Encoding]] [[#Flags]] {{$}}
+
+target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "spir64-unknown-unknown"
+
+; Function Attrs: mustprogress noinline nounwind optnone uwtable
+define dso_local noundef i32 @_Z3foov() #0 !dbg !10 {
+  ret i32 0, !dbg !16
+}
+
+attributes #0 = { mustprogress noinline nounwind optnone uwtable "frame-pointer"="all" "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!2, !3, !4, !5, !6, !7, !8}
+!llvm.ident = !{!9}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 17.0.0 (https://github.com/llvm/llvm-project.git b936816fb305cc16d2d1cd6d424c08c39a681a32)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None)
+!1 = !DIFile(filename: "/app/example.cpp", directory: "/app")
+!2 = !{i32 7, !"Dwarf Version", i32 4}
+!3 = !{i32 2, !"Debug Info Version", i32 3}
+!4 = !{i32 1, !"wchar_size", i32 4}
+!5 = !{i32 8, !"PIC Level", i32 2}
+!6 = !{i32 7, !"PIE Level", i32 2}
+!7 = !{i32 7, !"uwtable", i32 2}
+!8 = !{i32 7, !"frame-pointer", i32 2}
+!9 = !{!"clang version 17.0.0 (https://github.com/llvm/llvm-project.git b936816fb305cc16d2d1cd6d424c08c39a681a32)"}
+!10 = distinct !DISubprogram(name: "foo", linkageName: "_Z3foov", scope: !11, file: !11, line: 1, type: !12, scopeLine: 1, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !15)
+!11 = !DIFile(filename: "example.cpp", directory: "/app")
+!12 = !DISubroutineType(types: !13)
+!13 = !{!14}
+!14 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!15 = !{}
+!16 = !DILocation(line: 1, column: 13, scope: !10)