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Commit 2371e0a1 authored by Max Kazantsev's avatar Max Kazantsev
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[SCEV][NFC] Smarter implementation of isAvailableAtLoopEntry 

isAvailableAtLoopEntry duplicates logic of `properlyDominates` after checking invariance.
This patch replaces this logic with invocation of this method which is more profitable
because it supports caching.

Differential Revision: https://reviews.llvm.org/D43997

llvm-svn: 327373
parent 9f0b3170
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