[clang] [clang][AMDGPU] Widen ballot for read_exec_lo/hi to wavefront size (PR #212813)

[Arseniy Obolenskiy via cfe-commits]

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@@ -453,6 +453,10 @@ class LLVM_LIBRARY_VISIBILITY SPIRV64AMDGCNTargetInfo final
   void getTargetDefines(const LangOptions &Opts,
                         MacroBuilder &Builder) const override;
 
+  const llvm::omp::GV &getGridValue() const override {
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aobolensk wrote:

Why? This is used to retrieve the warp size

https://github.com/llvm/llvm-project/pull/212813