[IfConversion] Add missing check in IfConversion/canFallThroughTo
Summary:
When trying to figure out if MBB could fallthrough to ToMBB (possibly by
falling through a bunch of other MBBs) we didn't actually check if there
was fallthrough between the last two blocks in the chain.
Reviewers: kparzysz, iteratee, MatzeB
Reviewed By: kparzysz, iteratee
Subscribers: javed.absar, llvm-commits
Differential Revision: https://reviews.llvm.org/D32996
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@302650
91177308-0d34-0410-b5e6-
96231b3b80d8
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