Revert "SCEVExpander: Try hard not to create derived induction variables in other loops"

This reverts commit r201465. It broke an arm bot.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201466 91177308-0d34-0410-b5e6-96231b3b80d8
DwarfDebug: Remove dead code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201467 91177308-0d34-0410-b5e6-96231b3b80d8