[clang] [llvm] Adding splitdouble HLSL function (PR #109331)

[Tex Riddell via cfe-commits]

================
@@ -2074,6 +2083,19 @@ bool SemaHLSL::CheckBuiltinFunctionCall(unsigned 
BuiltinID, CallExpr *TheCall) {
       return true;
     break;
   }
+  case Builtin::BI__builtin_hlsl_elementwise_splitdouble: {
+    if (SemaRef.checkArgCount(TheCall, 3))
+      return true;
+
+    if (CheckScalarOrVector(&SemaRef, TheCall, SemaRef.Context.DoubleTy, 0) ||
+        CheckScalarOrVector(&SemaRef, TheCall, SemaRef.Context.UnsignedIntTy,
+                            1) ||
+        CheckScalarOrVector(&SemaRef, TheCall, SemaRef.Context.UnsignedIntTy,
+                            2))
+      return true;
----------------
tex3d wrote:

I just realized that we don't have tests for the 
`__builtin_hlsl_elementwise_splitdouble` operation for these diagnostics.  I 
think we need checks similar to those found in 
`clang/test/Sema/builtins-elementwise-math.c` but in a new test under 
`clang/test/SemaHLSL/BuiltIns/`.

https://github.com/llvm/llvm-project/pull/109331
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