[AArch64] fix profiling with GNU LINUX on Aarch64

[brzycki]

Summary

The GNU profiling support indicates that the interface is _mcount rather than mcount on GLIBC Linux for AArch64.

[sebpop]

LGTM.

[brzycki]

I realized after posting this I made a mistake in compilation and test. Because of this clang wasn't properly tested. This patch actually causes "ninja check-all" to fail for non-GNU AArch64 Linux targets.

I am able to link with clang using -pg -meabi gnu src.c

I'd like to withdraw this patch from revew.

clang/lib/Basic/Targets.cpp

LinuxTargetInfo(const llvm::Triple &Triple, const TargetOptions &Opts)
     this->WIntType = TargetInfo::UnsignedInt;
 
     switch (Triple.getArch()) {
     default:
       break;
     case llvm::Triple::ppc:
     case llvm::Triple::ppc64:
     case llvm::Triple::ppc64le:
+    case llvm::Triple::aarch64:
       this->MCountName = "_mcount";
       break;
     case llvm::Triple::x86:
     case llvm::Triple::x86_64:
     case llvm::Triple::systemz:
       this->HasFloat128 = true;
       break;
     }

clang/test/Frontend/gnu-mcount.c

 // RUN: %clang -target armv7-unknown-none-eabi -pg -S -emit-llvm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-ARM-EABI
 // RUN: %clang -target armv7-unknown-none-eabi -pg -meabi gnu -S -emit-llvm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-ARM-EABI-MEABI-GNU
 // RUN: %clang -target aarch64-unknown-none-eabi -pg -S -emit-llvm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-ARM64-EABI
 // RUN: %clang -target aarch64-unknown-none-eabi -pg -meabi gnu -S -emit-llvm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-ARM64-EABI-MEABI-GNU
 // RUN: %clang -target armv7-unknown-linux-gnueabi -pg -S -emit-llvm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-ARM-EABI
 // RUN: %clang -target armv7-unknown-linux-gnueabi -meabi gnu -pg -S -emit-llvm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-ARM-EABI-MEABI-GNU
 // RUN: %clang -target aarch64-unknown-linux-gnueabi -pg -S -emit-llvm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-ARM64-EABI
 // RUN: %clang -target aarch64-unknown-linux-gnueabi -meabi gnu -pg -S -emit-llvm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-ARM64-EABI-MEABI-GNU
+// RUN: %clang -target aarch64-unknown-linux-gnu -pg -S -emit-llvm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-ARM64-LINUX-GNU
 // RUN: %clang -target armv7-unknown-linux-gnueabihf -pg -S -emit-llvm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-ARM-EABI
 // RUN: %clang -target armv7-unknown-linux-gnueabihf -meabi gnu -pg -S -emit-llvm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-ARM-EABI-MEABI-GNU
 // RUN: %clang -target aarch64-unknown-linux-gnueabihf -pg -S -emit-llvm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-ARM64-EABI
 // RUN: %clang -target aarch64-unknown-linux-gnueabihf -meabi gnu -pg -S -emit-llvm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-ARM64-EABI-MEABI-GNU
 // RUN: %clang -target armv7-unknown-freebsd-gnueabihf -pg -S -emit-llvm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-ARM-EABI-FREEBSD
 // RUN: %clang -target armv7-unknown-freebsd-gnueabihf -meabi gnu -pg -S -emit-llvm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-ARM-EABI-FREEBSD
 // RUN: %clang -target aarch64-unknown-freebsd-gnueabihf -pg -S -emit-llvm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-ARM64-EABI-FREEBSD
 // RUN: %clang -target aarch64-unknown-freebsd-gnueabihf -meabi gnu -pg -S -emit-llvm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-ARM64-EABI-FREEBSD

 // RUN: %clang -target aarch64-unknown-cloudabi-gnueabihf -pg -S -emit-llvm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-ARM64-EABI-CLOUDABI
 // RUN: %clang -target aarch64-unknown-cloudabi-gnueabihf -meabi gnu -pg -S -emit-llvm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-ARM64-EABI-CLOUDABI
 
 int f() {
   return 0;
 }
 
 // CHECK-LABEL: f
+// CHECK-ARM64-LINUX-GNU: call void @_mcount()
 // CHECK-ARM-IOS-NOT: call void @_mcount()
 // CHECK-ARM-IOS-NOT: call void @"\01__gnu_mcount_nc"()
 // CHECK-ARM-EABI: call void @"\01mcount"()
 // CHECK-ARM-EABI-NOT: call void @"\01__gnu_mcount_nc"()
 // CHECK-ARM64-EABI: call void @mcount()
 // CHECK-ARM64-EABI-MEABI-GNU: call void @"\01_mcount"()
 // CHECK-ARM64-EABI-NOT: call void @"\01__gnu_mcount_nc"()
 // CHECK-ARM-EABI-FREEBSD: call void @__mcount()