[clang] [llvm] [HLSL] Add WaveGetLaneCount() intrinsic to FE (PR #143127)

[Nathan Gauër via cfe-commits]

================
@@ -691,6 +691,11 @@ Value *CodeGenFunction::EmitHLSLBuiltinExpr(unsigned 
BuiltinID,
     return EmitRuntimeCall(
         Intrinsic::getOrInsertDeclaration(&CGM.getModule(), ID));
   }
+  case Builtin::BI__builtin_hlsl_wave_get_lane_count: {
+    Intrinsic::ID ID = CGM.getHLSLRuntime().getWaveGetLaneCountIntrinsic();
+    return EmitRuntimeCall(
----------------
Keenuts wrote:

Reason why other wave intrinsics are using this instead of 
Builder.CreateIntrinsics are convergence intrinsics: correctly adding the token 
to the call.

https://github.com/llvm/llvm-project/pull/143127
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