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

[via cfe-commits]

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@@ -546,6 +546,9 @@ struct BuiltinTypeMethodBuilder {
 public:
   ~BuiltinTypeMethodBuilder() { finalizeMethod(); }
 
+  BuiltinTypeMethodBuilder(BuiltinTypeMethodBuilder &Other) = delete;
+  BuiltinTypeMethodBuilder &operator=(BuiltinTypeMethodBuilder &Other) = delete;
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cor3ntin wrote:

```suggestion
  BuiltinTypeMethodBuilder(const BuiltinTypeMethodBuilder &Other) = delete;
  BuiltinTypeMethodBuilder &operator=(const BuiltinTypeMethodBuilder &Other) = delete;
```

https://github.com/llvm/llvm-project/pull/120090