[LCSSA] Do not remove used PHI nodes in formLCSSAForInstructions
Summary:
In formLCSSAForInstructions we speculatively add new PHI
nodes, that sometimes ends up without having any uses. It
has been discovered that sometimes an added PHI node can
appear as being unused in one iteration of the Worklist,
although it can end up being used by a PHI node added in
a later iteration. We now check, a second time, that the
PHI node still is unused before we remove it. This avoids
an assert about "Trying to remove a phi with uses." for the
added test case.
Reviewers: davide, mzolotukhin, mattd, dberlin
Reviewed By: mzolotukhin, dberlin
Subscribers: dberlin, mzolotukhin, davide, bjope, uabelho, llvm-commits
Differential Revision: https://reviews.llvm.org/D46422
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@331741
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