[clang] [Clang][Sema] Fix crash handling static data members of a local class within a lambda (PR #177444)

[Shafik Yaghmour via cfe-commits]

https://github.com/shafik commented:

Please add a more detailed summary outlining the problem you are solving and how you are fixing it. I should be able to avoid having to visit the original bug to make sure I get what is being fixed.

https://github.com/llvm/llvm-project/pull/177444