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

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eaeltsin wrote:

Heads-up - this commit might have introduced compilation non-determinism.

Will try to cook the reproducer soon. Meanwhile, can you please double-check there are no non-deterministic pieces, such as sorting by address, etc.?


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