[clang] [Clang] Fixed a crash when instantiating an invalid out-of-line static data member definition in a local class (PR #196772)

[Oliver Hunt via cfe-commits]

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

This should also include a test that ensures we diagnose without instantiating.

https://github.com/llvm/llvm-project/pull/196772