[llvm] [InstCombine] Allow freezing multiple operands (PR #154336)

[Nikita Popov via llvm-commits]

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nikic wrote:

The phi case is trickier because we need to make sure that we don't end up pushing a freeze around a loop. We should at least extend foldFreezeIntoRecurrence() to allow freezing multiple out-of-loop values though.

https://github.com/llvm/llvm-project/pull/154336