[AST] When we @synthesize a property with a user-defined ivar name,
make sure to record the source location of the ivar name.
[libclang] When indexing @synthesized objc methods, report the @implementation
as the lexical container.

Fixes rdar://10905472

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@151635 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed