Sanjoy Das a7ff6d36af Use WeakVH instead of WeakTrackingVH in AliasSetTracker's UnkownInsts
Summary:
In cases where an instruction (a call site, say) is RAUW'ed with some
other value (this is possible via the `returned` attribute, amongst
other things), we want the slot in UnknownInsts to point to the
original Instruction we wanted to track, not the value it got replaced
by.

Fixes PR32587.

Reviewers: davide

Subscribers: mcrosier, llvm-commits

Differential Revision: https://reviews.llvm.org/D32268

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@301426 91177308-0d34-0410-b5e6-96231b3b80d8
2017-04-26 16:21:02 +00:00
2017-04-26 16:20:52 +00:00
2017-04-26 16:20:59 +00:00

Low Level Virtual Machine (LLVM)
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