Update extended and vector overload support for DXIL

- Apply fixes

Author: tex3d

lib/DXIL/DxilOperations.cpp

@@ -3253,7 +3253,7 @@ bool OP::IsOverloadLegal(OpCode opCode, Type *pType) {
         return false;
       if (OloadSlot == kVectorTypeSlot) {
         unsigned EltTypeSlot =
-            GetTypeSlot(cast<VectorType>(pType)->getElementType());
+            GetTypeSlot(cast<VectorType>(ElTy)->getElementType());
         if (!OpProps.AllowedVectorElements[I][EltTypeSlot])
           return false;
       }

utils/hct/hctdb.py

@@ -232,6 +232,10 @@ def process_oload_types(self):
             self.vector_oload_types[n] = vector_oloads
         if len(oload_types) > 1:
             self.oload_types = "x"
+            self.extended_oload_types[: len(oload_types)] = oload_types
+            self.check_extended_oload_ops()
+        else:
+            self.oload_types = oload_types[0]
 
     def check_extended_oload_ops(self):
         "Ensure ops has sequential extended overload references with $x0, $x1, etc."