[llvm] [GlobalIsel] Combine zext of trunc (episode II) (PR #108305)

[Matt Arsenault via llvm-commits]

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arsenm wrote:

> I closed this PR because of the regressions.

Doesn't make sense to me. We still need this at some point. You can just add it and enable later when they are avoided? 

https://github.com/llvm/llvm-project/pull/108305