[llvm] r338109 - Revert "[LV][DebugInfo] Set DL to the middle block Icmp instruction"

Hi @gramanas,
When you revert a commit, please edit the commit message to say why.
It can be instructive to know that compiler X version Y complains
about feature Z, if that's the problem; or if tests are failing,
whether it's particular to given arch or OS can be worth knowing.
Thanks,
--paulr