[libclang/AST]

AST: For auto-synthesized ivars give them the location of the related
property (previously they had no source location). This allows them
to be indexed by libclang.

libclang: Make sure synthesized ivars are indexed before the methods that
may reference them.

Fixes rdar://11607001.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@158189 91177308-0d34-0410-b5e6-96231b3b80d8