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

[Tex Riddell via cfe-commits]

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@@ -18952,6 +18955,142 @@ case Builtin::BI__builtin_hlsl_elementwise_isinf: {
         CGM.getHLSLRuntime().getRadiansIntrinsic(), ArrayRef<Value *>{Op0},
         nullptr, "hlsl.radians");
   }
+  case Builtin::BI__builtin_hlsl_splitdouble: {
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tex3d wrote:

This is quite a lot of code in this case of the switch statement, perhaps we could break this out into a static function?

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