[clang] [clang] Handle instantiated members to determine visibility (PR #136128)

[Jan Patrick Lehr via cfe-commits]

jplehr wrote:

I can try later today to get dumps/preprocessed source or maybe some better idea on how to reproduce the issue.
@jhuber6 if you have immediate thoughts on how to provide that (or maybe even what may be the issue), let me know.

https://github.com/llvm/llvm-project/pull/136128