commit 40f8300dd1733f79fa27d35eb98baa510caaffac
author Alexandros Lamprineas <alexandros.lamprineas@arm.com> Mon Jul 23 10:56:30 2018 +0000
committer Alexandros Lamprineas <alexandros.lamprineas@arm.com> Mon Jul 23 10:56:30 2018 +0000
tree ef360dd6f1bd5b6655a9bfcc40798dcdfff67c06
parent ef8ab912b618a3b3a9ff9c8985ca19e0f15e8c4c

[MemorySSAUpdater] Update Phi operands after trivial Phi elimination

Bug fix for PR37445. The underlying problem and its fix are similar to PR37808.
The bug lies in MemorySSAUpdater::getPreviousDefRecursive(), where PhiOps is
computed before the call to tryRemoveTrivialPhi() and it ends up being out of
date, pointing to stale data. We have now turned each of the PhiOps into a
TrackingVH<MemoryAccess>.

Differential Revision: https://reviews.llvm.org/D49425

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@337680 91177308-0d34-0410-b5e6-96231b3b80d8