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Commit 5a6dfb27 authored by Max Kazantsev's avatar Max Kazantsev
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[IndVars] Replace PHIs if loop exits on 1st iteration 

This is a part of D108910.
We replace all loop PHIs with values coming from the loop preheader if
we proved that backedge is never taken.

Patch by Dmitry Makogon!

Differential Revision: https://reviews.llvm.org/D109596
Reviewed By: lebedev.ri
parent d48a3f9f
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