Objective-C arc: Improve disgnostics when 'weak'
property cannot be synthesized because its backing
ivar does not support weak references.
// rdar://13676793


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@180211 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed