[profile] runtime counter relocation needed on all windows targets (#127858)

See PR comments for the discussion that led to this commit.

Author: Wael Yehia

clang/lib/Driver/ToolChains/Clang.cpp

@@ -762,8 +762,7 @@ static void addPGOAndCoverageFlags(const ToolChain &TC, Compilation &C,
     else {
       CmdArgs.push_back("-fprofile-continuous");
       // Platforms that require a bias variable:
-      if (T.isOSBinFormatELF() || T.isOSAIX() ||
-          T.isKnownWindowsMSVCEnvironment()) {
+      if (T.isOSBinFormatELF() || T.isOSAIX() || T.isOSWindows()) {
         CmdArgs.push_back("-mllvm");
         CmdArgs.push_back("-runtime-counter-relocation");
       }

clang/test/Driver/fprofile-continuous.c

@@ -7,6 +7,7 @@
 // RUN: %clang --target=powerpc64-ibm-aix -fprofile-generate -fprofile-continuous -### -c %s 2>&1 | FileCheck %s --check-prefix=RELOC
 // RUN: %clang --target=x86_64-unknown-fuchsia -fprofile-generate -fprofile-continuous -### -c %s 2>&1 | FileCheck %s --check-prefix=RELOC
 // RUN: %clang --target=x86_64-windows-msvc -fprofile-generate -fprofile-continuous -### -c %s 2>&1 | FileCheck %s --check-prefix=RELOC
+// RUN: %clang --target=x86_64-windows-gnu -fprofile-generate -fprofile-continuous -### -c %s 2>&1 | FileCheck %s --check-prefix=RELOC
 // RELOC: "-cc1" {{.*}} "-fprofile-continuous" "-mllvm" "-runtime-counter-relocation"
 
 // 2) test -fprofile-continuous with cs-profile-generate and -fprofile-instr-generate