[HLSL][NFC] Fix static analyzer concerns

Class BuiltinTypeMethodBuilder has a user-defined destructor so likely
compiler generated special functions may behave incorrectly. Delete
explicitly copy constructor and copy assignment operator to avoid
potential errors.

Author: Fznamznon

clang/lib/Sema/HLSLExternalSemaSource.cpp

@@ -546,6 +546,9 @@ struct BuiltinTypeMethodBuilder {
 public:
   ~BuiltinTypeMethodBuilder() { finalizeMethod(); }
 
+  BuiltinTypeMethodBuilder(BuiltinTypeMethodBuilder &Other) = delete;
+  BuiltinTypeMethodBuilder &operator=(BuiltinTypeMethodBuilder &Other) = delete;
+
   Expr *getResourceHandleExpr() {
     // The first statement added to a method or access to 'this' creates the
     // declaration.