[llvm] [IR] `replaceUsesWith` when aliasing a GV and the use is `dso_local_equivalent` (PR #220336)

[Teresa Johnson via llvm-commits]

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+; REQUIRES: x86-registered-target
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teresajohnson wrote:

Can you add a comment or so about what specifically we are looking for in the test (especially pointing to what was broken before)

https://github.com/llvm/llvm-project/pull/220336