Reland "[PS4/PS5][profiling] Go back to the old way of doing a runtime hook"

Profiling stopped working for us after D98061, which was largely a
Fuschia-specific patch but in one place used `isOSBinFormatELF` to
make a decision.  I'm adding a PS4/PS5 exception to that, so we can
get profiling to work again.

Differential Revision: https://reviews.llvm.org/D127506

Author: pogo59

llvm/lib/Transforms/Instrumentation/InstrProfiling.cpp

@@ -1246,7 +1246,7 @@ bool InstrProfiling::emitRuntimeHook() {
       new GlobalVariable(*M, Int32Ty, false, GlobalValue::ExternalLinkage,
                          nullptr, getInstrProfRuntimeHookVarName());
 
-  if (TT.isOSBinFormatELF()) {
+  if (TT.isOSBinFormatELF() && !TT.isPS()) {
     // Mark the user variable as used so that it isn't stripped out.
     CompilerUsedVars.push_back(Var);
   } else {

llvm/test/Instrumentation/InstrProfiling/profiling.ll

@@ -2,8 +2,10 @@
 
 ; RUN: opt < %s -mtriple=x86_64-apple-macosx10.10.0 -passes=instrprof -S | FileCheck %s --check-prefixes=MACHO
 ; RUN: opt < %s -mtriple=x86_64 -passes=instrprof -S | FileCheck %s --check-prefix=ELF_GENERIC
-; RUN: opt < %s -mtriple=x86_64-unknown-linux -passes=instrprof -S | FileCheck %s --check-prefixes=ELF
-; RUN: opt < %s -mtriple=x86_64-unknown-fuchsia -passes=instrprof -S | FileCheck %s --check-prefixes=ELF
+; RUN: opt < %s -mtriple=x86_64-unknown-linux -passes=instrprof -S | FileCheck %s --check-prefixes=ELF,ELFRT
+; RUN: opt < %s -mtriple=x86_64-unknown-fuchsia -passes=instrprof -S | FileCheck %s --check-prefixes=ELF,ELFRT
+; RUN: opt < %s -mtriple=x86_64-scei-ps4 -passes=instrprof -S | FileCheck %s --check-prefixes=ELF,PS
+; RUN: opt < %s -mtriple=x86_64-sie-ps5 -passes=instrprof -S | FileCheck %s --check-prefixes=ELF,PS
 ; RUN: opt < %s  -mtriple=x86_64-pc-win32-coff -passes=instrprof -S | FileCheck %s --check-prefixes=COFF
 ; RUN: opt < %s -mtriple=powerpc64-ibm-aix-xcoff -passes=instrprof -S | FileCheck %s --check-prefixes=XCOFF
 
@@ -104,8 +106,10 @@ declare void @llvm.instrprof.increment(i8*, i64, i32, i32)
 ; MACHO:   ret i32 %[[REG]]
 ; MACHO: }
 ; COFF: define linkonce_odr hidden i32 @__llvm_profile_runtime_user() {{.*}} comdat {
-; ELF-NOT: define linkonce_odr hidden i32 @__llvm_profile_runtime_user() {{.*}} {
-; ELF-NOT:   %[[REG:.*]] = load i32, i32* @__llvm_profile_runtime
+; ELFRT-NOT: define linkonce_odr hidden i32 @__llvm_profile_runtime_user() {{.*}} {
+; ELFRT-NOT:   %[[REG:.*]] = load i32, i32* @__llvm_profile_runtime
+; PS: define linkonce_odr hidden i32 @__llvm_profile_runtime_user() {{.*}} {
+; PS:   %[[REG:.*]] = load i32, i32* @__llvm_profile_runtime
 ; XCOFF: define linkonce_odr hidden i32 @__llvm_profile_runtime_user() {{.*}} {
 ; XCOFF:   %[[REG:.*]] = load i32, i32* @__llvm_profile_runtime
 ; XCOFF:   ret i32 %[[REG]]