[clang] [llvm] Add length HLSL function to DirectX Backend (PR #101256)

[Farzon Lotfi via cfe-commits]

================
@@ -1079,6 +1079,28 @@ bool SemaHLSL::CheckBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall) {
       return true;
     break;
   }
+  case Builtin::BI__builtin_hlsl_elementwise_length: {
+    if (SemaRef.checkArgCount(TheCall, 1))
+      return true;
+    if (SemaRef.PrepareBuiltinElementwiseMathOneArgCall(TheCall))
+      return true;   
+
+    ExprResult A = TheCall->getArg(0);
+    QualType ArgTyA = A.get()->getType();
+    QualType RetTy;
+
+    if (auto *VTy = ArgTyA->getAs<VectorType>()) 
+      RetTy = VTy->getElementType();
+		else 
+      RetTy = TheCall->getArg(0)->getType();
+
+    TheCall->setType(RetTy);     
+
+
+    if (CheckFloatOrHalfRepresentations(&SemaRef, TheCall))
----------------
farzonl wrote:

see line(s) 1122-1142 delete this conditional and add ` case Builtin::BI__builtin_hlsl_elementwise_length:` alphabetically to that  case block.

https://github.com/llvm/llvm-project/pull/101256