[clang] [clang][ASTImporter] Fix crash when template class static member imported to other translation unit. (PR #68774)

[Balázs Kéri via cfe-commits]

https://github.com/balazske commented:

The fix looks good but the formatting of the test code could be better, like in the other tests.

https://github.com/llvm/llvm-project/pull/68774