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Max Kazantsev 13391d5a59 [IndVars] Provide eliminateIVComparison with context
We can prove more predicates when we have a context when eliminating ICmp.
As first (and very obvious) approximation we can use the ICmp instruction itself,
though in the future we are going to use a common dominator of all its users.
Need some refactoring before that.

Observed ~0.5% negative compile time impact.

Differential Revision: https://reviews.llvm.org/D98697
Reviewed By: lebedev.ri
2021-03-19 12:28:22 +07:00
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