Turn -fixit it back into a mode, but make -fixit-at imply that mode this time
(instead of running it with arbitrary consumers).
 - Also, turn any -fixit-at lookup failure into an error.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@88757 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed