[LoopDeletion] NFC: Move phi node value setting into prepass
Recommit NFC patch (rL306157) where I missed incrementing the basic block iterator,
which caused loop deletion tests to hang due to infinite loop.
Had reverted it in rL306162.
rL306157 commit message:
Currently, the implementation of delete dead loops has a special case
when the loop being deleted is never executed. This special case
(updating of exit block's incoming values for phis) can be
run as a prepass for non-executable loops before performing
the actual deletion.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@306254
91177308-0d34-0410-b5e6-
96231b3b80d8
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