[clang] [llvm] [clang][HLSL][SPRI-V] Add convergence intrinsics (PR #80680)

[Nathan Gauër via cfe-commits]

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@@ -4554,6 +4554,13 @@ def HLSLWaveActiveCountBits : LangBuiltin<"HLSL_LANG"> {
   let Prototype = "unsigned int(bool)";
 }
 
+// HLSL
+def HLSLWaveGetLaneIndex : LangBuiltin<"HLSL_LANG"> {
+  let Spellings = ["__builtin_hlsl_wave_get_lane_index"];
+  let Attributes = [NoThrow, Const];
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Keenuts wrote:

Yes, but this implies touching to the mangling pattern..

https://github.com/llvm/llvm-project/pull/80680