[llvm-branch-commits] [llvm] release/18.x: [GlobalOpt] Don't replace aliasee with alias that has weak linkage (#91483) (PR #92468)

[Eli Friedman via llvm-branch-commits]

https://github.com/efriedma-quic approved this pull request.

LGTM

This only affects optimizations on weak aliases, and the logic is very simple: just don't optimize them.

As noted on the original pull request, this also affects some cases which might be safe to optimize (a weak alias where the aliasee is an internal symbol with no other references). But "optimizing" those cases doesn't really have any useful effect, anyway: it doesn't unblock any additional optimizations, and the resulting ELF is basically identical.

https://github.com/llvm/llvm-project/pull/92468