Add test case for PR5868, and improve location information slightly for implicit "this" expressions

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@92141 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/TreeTransform.h b/lib/Sema/TreeTransform.h
index 61b57e7..7db723b 100644
--- a/lib/Sema/TreeTransform.h
+++ b/lib/Sema/TreeTransform.h
@@ -959,6 +959,7 @@
       Expr *BaseExpr = Base.takeAs<Expr>();
       if (getSema().PerformObjectMemberConversion(BaseExpr, Member))
         return getSema().ExprError();
+
       MemberExpr *ME =
         new (getSema().Context) MemberExpr(BaseExpr, isArrow,
                                            Member, MemberLoc,