[LoopUnswitch] Make DEBUG output more readable (part 2).

I fixed my miscompile in r301722 and I hope I don't have to take
a look at this code again now that Chandler has a new LoopUnswitch
pass, but maybe this could be of use for somebody else in the
meanwhile.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@301723 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed