Iterate backwards over debug locations when splitting them so they can be safely erased.

This should unbreak dragonegg-i386-linux and build-self-4-mingw32.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131007 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed