[llvm] 6102310 - [InstSimplify][EarlyCSE] Try to CSE PHI nodes in the same basic block

[Owen Anderson via llvm-commits]

> On Aug 28, 2020, at 2:21 PM, Nikita Popov via llvm-commits <llvm-commits at lists.llvm.org> wrote:
> 
> As for actual breakage: I have a strong suspicion that this change has introduced compiler non-determinism. Looking at https://llvm-compile-time-tracker.com/index.php?config=ReleaseThinLTO&stat=size-text <https://llvm-compile-time-tracker.com/index.php?config=ReleaseThinLTO&stat=size-text> text size fluctuations have started occurring directly after this commit.
> 
> Regards,
> Nikita
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I’ve just finished bisecting a stage3 mismatch on x86 linux and tracked it down to this diff as well.  I’m going to move ahead with a revert.

—Owen
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