Add IsImplicit field in ObjCMessageExpr that is true when the message
was constructed, e.g. for a property access.

This allows the selector identifier locations machinery for ObjCMessageExpr
to function correctly, in that there are not real locations to handle/report for
such a message.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@148013 91177308-0d34-0410-b5e6-96231b3b80d8
10 files changed