[clang] [C++20][Modules] Fix crash when function and lambda inside loaded from different modules (PR #109167)

[Dmitry Polukhin via cfe-commits]

https://github.com/dmpolukhin commented:

All comments resolved, also I added TODO that we might want to use ondisk hash table to allow lazy deserialization for the new record.

https://github.com/llvm/llvm-project/pull/109167