[llvm] [DirectX] Make dx.RawBuffer an op that can't be replaced (PR #154620)

[Nikita Popov via llvm-commits]

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@@ -233,6 +233,9 @@ class Type {
   /// Return true if this is 'token'.
   bool isTokenTy() const { return getTypeID() == TokenTyID; }
 
+  /// Returns true if this is 'token' or 'token-like'.
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nikic wrote:

```suggestion
  /// Returns true if this is 'token' or a token-like target type.
```

https://github.com/llvm/llvm-project/pull/154620