If we're resolving all outstanding fixups, and there are multiple fixups

If we're resolving all outstanding fixups, and there are multiple fixups
for the same destination, then we must potentially rewrite the initial branch
of every fixup.  Without this patch, a short-circuit check meant to prevent
a switch case from being redundantly added was preventing later fixups from
being processed.  Fixes PR8175 (again).

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@115586 91177308-0d34-0410-b5e6-96231b3b80d8