[clang] [clang][HLSL] Add GroupMemoryBarrierWithGroupSync intrinsic (PR #111883)

[Finn Plummer via cfe-commits]

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@@ -4830,6 +4830,12 @@ def HLSLRadians : LangBuiltin<"HLSL_LANG"> {
   let Prototype = "void(...)";
 }
 
+def HLSLGroupMemoryBarrierWithGroupSync: LangBuiltin<"HLSL_LANG"> {
+  let Spellings = ["__builtin_hlsl_group_memory_barrier_with_group_sync"];
+  let Attributes = [NoThrow, Const];
+  let Prototype = "void(...)";
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inbelic wrote:

As with `WaveIsFirstLane` I don't think we need `...` and can just do `()`

https://github.com/llvm/llvm-project/pull/111883