[arcmt] When we already removed a __weak, don't try to change it to __unsafe_unretained
later on, or we will end up with a redundant '__unsafe_unretained'.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@144059 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed