IndVarSimplify fixes proposed for 3.5.1

[Justin Bogner]

David Majnemer <david.majnemer at gmail.com> writes:
> Hi, I think the following list of commit revisions should be merged into
> 3.5.1:
>
> r217102 IndVarSimplify: Don't let LFTR compare against a poison value
> r217115 IndVarSimplify: Address review comments for r217102

I believe you also need the test fix in r217104. The 3.5 bot is failing
on the Misc/backend-optimization-failure.cpp test now:

http://lab.llvm.org:8080/green/job/clang-stage1-configure-Rlto_release_check/29/