[clang-tools-extra] [clang-tidy] Workaround for cppcoreguidelines-pro-type-union-access if memLoc is invalid (PR #104540)

[Piotr Zegar via cfe-commits]

https://github.com/PiotrZSL requested changes to this pull request.

Missing release notes entry, about what's fixed in check.
For me this is an full-fix, not an workaround.

https://github.com/llvm/llvm-project/pull/104540