[clang] [Clang] Avoid querying tag definitions for invalid DeclSpecs (PR #210085)

[Tony Guillot via cfe-commits]

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@@ -371,6 +371,9 @@ features cannot lower the translation-unit ABI level;
 
 #### Miscellaneous Clang Crashes Fixed
 
+- Fixed a crash when parsing invalid C++ declarations that combine `auto` with
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to268 wrote:

Remove the release notes entry, since this is a trunk regression.
This would need to be cherry picked on the release branch after merging the PR.

https://github.com/llvm/llvm-project/pull/210085