[clang] [clang-tools-extra] [clang] fix diagnostic printing of expressions ignoring LangOpts (PR #134693)

[Erich Keane via cfe-commits]

================
@@ -280,6 +280,9 @@ Improvements to Clang's diagnostics
 - Clang now better preserves the sugared types of pointers to member.
 - Clang now better preserves the presence of the template keyword with dependent
   prefixes.
+- Clang now respects the current language mode when printing expressions in
+  diagnsotics. This fixes a bunch of `bool` being printed as `_Bool`, and also
----------------
erichkeane wrote:

```suggestion
  diagnostics. This fixes a bunch of `bool` being printed as `_Bool`, and also
```

https://github.com/llvm/llvm-project/pull/134693