[llvm] [NFC][AlwaysInliner] Reduce AlwaysInliner memory consumption. (PR #96958)

[Arthur Eubanks via llvm-commits]

https://github.com/aeubanks commented:

so the issue is that if we have for example a bunch of internal functions that are used once by another internal function, we may run into quadratic memory usage if everything is inlined? that makes sense

https://github.com/llvm/llvm-project/pull/96958