Daniel Berlin cd3dcaa09e [MSSA] Fix PR28880 by fixing use optimizer's lower bound tracking behavior.
Summary:
In the use optimizer, we need to keep of whether the lower bound still
dominates us or else we may decide a lower bound is still valid when it
is not due to intervening pushes/pops.  Fixes PR28880 (and probably a
bunch of other things).

Reviewers: george.burgess.iv

Subscribers: MatzeB, llvm-commits, sebpop

Differential Revision: https://reviews.llvm.org/D23237

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@277978 91177308-0d34-0410-b5e6-96231b3b80d8
2016-08-08 04:44:53 +00:00
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