objc++: Some level of covariance is allowed in ObjC properties.
Make it also available in ObjC++ propeties. // rdar://9740328


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@135001 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed