Simplify optimization-remark.c test following r211610

With LocTrackingOnly there's no longer a user-facing distinction so the NDEBUG
checks can go away. (Except maybe column info, but -verify only checks line
numbers anyway.)

Also add a RUN line to validate the traditional !LocTrackingOnly case.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@211622 91177308-0d34-0410-b5e6-96231b3b80d8