[clang] [llvm] [clang][OpenMP][SPIR-V] Fix addrspace of globals and global constants (PR #134399)

[Nick Sarnie via cfe-commits]

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@@ -5384,6 +5384,11 @@ LangAS CodeGenModule::GetGlobalVarAddressSpace(const VarDecl *D) {
     LangAS AS;
     if (OpenMPRuntime->hasAllocateAttributeForGlobalVar(D, AS))
       return AS;
+    if (LangOpts.OpenMPIsTargetDevice && getTriple().isSPIRV())
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sarnex wrote:

BTW codegen already does the right thing because of [this](https://github.com/llvm/llvm-project/blob/10bef367a5643bc41d0172b02e080645c68f821a/clang/lib/CodeGen/CodeGenModule.cpp#L5394) code in GetGlobalConstantAddressSpace, and `CodeGenOpenCL/str_literals.cl` already locks it down, so the OpenCL part of my change is basically NFC.

https://github.com/llvm/llvm-project/pull/134399