[LoopUnswitch] Make DEBUG output more readable.

While debugging a miscompile I realized loopunswitch doesn't
put newlines when printing the instruction being replacement.
Ending up with a single line with many instruction replaced isn't
the best for readability and/or mental sanity.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@301692 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed