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

[Tex Riddell via cfe-commits]

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@@ -4871,6 +4871,12 @@ def HLSLRadians : LangBuiltin<"HLSL_LANG"> {
   let Prototype = "void(...)";
 }
 
+def HLSLSplitDouble: LangBuiltin<"HLSL_LANG"> {
+  let Spellings = ["__builtin_hlsl_splitdouble"];
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tex3d wrote:

Are we inconsistent on the use of "elementwise"?  Shouldn't we have that here?

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