[clang] [llvm] [AMDGPU] Add clang builtin for s_bitreplicate intrinsic (PR #206177)

[Shilei Tian via llvm-commits]

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@@ -378,6 +378,7 @@ def __builtin_amdgcn_perm : AMDGPUBuiltin<"unsigned int(unsigned int, unsigned i
 //===----------------------------------------------------------------------===//
 
 def __builtin_amdgcn_fmed3h : AMDGPUBuiltin<"__fp16(__fp16, __fp16, __fp16)", [Const], "gfx9-insts">;
+def __builtin_amdgcn_s_bitreplicate : AMDGPUBuiltin<"uint64_t(unsigned int)", [Const], "gfx9-insts">;
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shiltian wrote:

Add documentation pls.

https://github.com/llvm/llvm-project/pull/206177