[clang] [clang][Lex] Don't parsing header name as a string literal (PR #201763)

[Aaron Ballman via cfe-commits]

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@@ -666,6 +666,7 @@ Bug Fixes in This Version
 - Fixed a crash when ``#embed`` is used with C++ modules (#GH195350)
 - Fixed an issue where ``__typeof_unqual`` and ``__typeof_unqual__`` were rejected as a declaration specifier in block scope in C++.
 - Fixed crash when checking for overflow for unary operator that can't overflow (#GH170072)
+- Clang now don't handling `" q-char-sequence "` header name as a string literal (#GH132643).
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AaronBallman wrote:

```suggestion
- Clang no longer handles a `" q-char-sequence "` header name as a string literal (#GH132643).
```

https://github.com/llvm/llvm-project/pull/201763