objective-c: warn when autosynthesizing a property which has same
name as an existing ivar since this is common source of error
when people remove @synthesize to take advantage of autosynthesis. 
// rdar://11671080


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@158756 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed