[clang] [llvm] Add cross builtins and cross HLSL function to DirectX and SPIR-V backend (PR #109180)

[Damyan Pepper via cfe-commits]

================
@@ -1704,6 +1704,20 @@ bool SemaHLSL::CheckBuiltinFunctionCall(unsigned 
BuiltinID, CallExpr *TheCall) {
       return true;
     break;
   }
+  case Builtin::BI__builtin_hlsl_cross: {
+    if (SemaRef.checkArgCount(TheCall, 2))
+      return true;
+    if (CheckVectorElementCallArgs(&SemaRef, TheCall))
+      return true;
+    if (CheckFloatOrHalfRepresentations(&SemaRef, TheCall))
+      return true;
+
----------------
damyanp wrote:

I can't find a `float4 builtin_cross_float4(float4  p1, float4  p2)` case?  Do 
`float4`s implicitly truncate to `float3` perhaps?

https://github.com/llvm/llvm-project/pull/109180
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