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Unverified Commit 961483a5 authored by Roman Lebedev's avatar Roman Lebedev
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[NFCI][Local] Rewrite EliminateDuplicatePHINodes to optionally check hashing invariants 

EarlyCSE has a mode to verify the invariant that hash equality equals
key equality, but EliminateDuplicatePHINodes() doesn't.

I've verified that this would have caught the stage2-stage3 mismatches
5ec2b757 revert has fixed,
that were introduced last time in 3e69871a.
parent 1364d856
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