[clang] [llvm] [HLSL] Implement dot2add intrinsic (PR #131237)

[Sumit Agarwal via cfe-commits]

================
@@ -2473,11 +2473,9 @@ bool SemaHLSL::CheckBuiltinFunctionCall(unsigned 
BuiltinID, CallExpr *TheCall) {
     break;
   }
   case Builtin::BI__builtin_hlsl_dot2add: {
-    // Check number of arguments should be 3
     if (SemaRef.checkArgCount(TheCall, 3))
       return true;
 
-    // Check first two arguments are vector of length 2 with half data type
     auto checkHalfVectorOfSize2 = [](clang::QualType PassedType) -> bool {
----------------
sumitsays wrote:

Surprisingly removing these checks does not throw semantic errors, which it 
should have.

https://github.com/llvm/llvm-project/pull/131237
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