[HIP] Default to COV5 for HIP compilations (#116077)

Summary:
This was done a long time ago for OpenMP, but it seems HIP was never
updated. This patch rectifies that. The default for the LLVM backend is
5 so this is probably required for some stuff.

Author: jhuber6

clang/lib/Driver/ToolChains/CommonArgs.cpp

@@ -2710,7 +2710,7 @@ void tools::checkAMDGPUCodeObjectVersion(const Driver &D,
 
 unsigned tools::getAMDGPUCodeObjectVersion(const Driver &D,
                                            const llvm::opt::ArgList &Args) {
-  unsigned CodeObjVer = 4; // default
+  unsigned CodeObjVer = 5; // default
   if (auto *CodeObjArg = getAMDGPUCodeObjectArgument(D, Args))
     StringRef(CodeObjArg->getValue()).getAsInteger(0, CodeObjVer);
   return CodeObjVer;

clang/test/Driver/hip-device-libs.hip

@@ -157,11 +157,12 @@
 // Test default code object version.
 // RUN: %clang -### --target=x86_64-linux-gnu --offload-arch=gfx900 \
 // RUN:   --rocm-path=%S/Inputs/rocm %S/Inputs/hip_multiple_inputs/b.hip \
-// RUN: 2>&1 | FileCheck %s --check-prefixes=ABI4
+// RUN: 2>&1 | FileCheck %s --check-prefixes=ABI5
 
 // Test default code object version with old device library without abi_version_400.bc
 // RUN: %clang -### --target=x86_64-linux-gnu --offload-arch=gfx900 \
-// RUN:   --hip-device-lib-path=%S/Inputs/rocm/amdgcn/bitcode-no-abi-ver   \
+// RUN:   -mcode-object-version=4 \
+// RUN:   --hip-device-lib-path=%S/Inputs/rocm/amdgcn/bitcode-no-abi-ver \
 // RUN:   --rocm-path=%S/Inputs/rocm %S/Inputs/hip_multiple_inputs/b.hip \
 // RUN: 2>&1 | FileCheck %s --check-prefixes=NOABI4