[clang] Add SPIRV support to HIPAMD toolchain (PR #75357)

[Yaxun Liu via cfe-commits]

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@@ -209,6 +210,13 @@ void AMDGCN::Linker::ConstructJob(Compilation &C, const JobAction &JA,
   if (JA.getType() == types::TY_LLVM_BC)
     return constructLlvmLinkCommand(C, JA, Inputs, Output, Args);
 
+  if (Args.getLastArgValue(options::OPT_mcpu_EQ) == "generic") {
+    llvm::opt::ArgStringList TrArgs{"--spirv-max-version=1.1",
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yxsamliu wrote:

> I wonder if `-mcpu` is the correct way to encode this. Targeting SPIR-V is more like the triple than the architecture as far as I'm aware.

I will see whether I can use triple instead.

https://github.com/llvm/llvm-project/pull/75357