[StatepointsForGC] Rematerialize in the presence of PHIs
Summary:
While walking the use chain for identifying rematerializable values in RS4GC,
add the case where the current value and base value are the same PHI nodes.
This will aid rematerialization of geps and casts instead of relocating.
Reviewers: sanjoy, reames, igor
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D23920
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@279975
91177308-0d34-0410-b5e6-
96231b3b80d8
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