Tweak the ObjCAtSyncChecker to assume that a mutex is non-nil after checking that it is
nil.  Otherwise we can get false paths where a second @synchronized using the mutex
can have a bogus warning.  Fixes <rdar://problem/8578650>.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@117016 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed