[HLSL][NFC] Fix static analyzer concerns (llvm#120090)

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

@@ -559,6 +559,10 @@ struct BuiltinTypeMethodBuilder {
 public:
   ~BuiltinTypeMethodBuilder() { finalizeMethod(); }
 
+  BuiltinTypeMethodBuilder(const BuiltinTypeMethodBuilder &Other) = delete;
+  BuiltinTypeMethodBuilder &
+  operator=(const BuiltinTypeMethodBuilder &Other) = delete;
+
   Expr *getResourceHandleExpr() {
     // The first statement added to a method or access to 'this' creates the
     // declaration.