Do the error recovery for @end only.
I am not sure how much we can improve for
when a randon ObjC keyword is thrown into the
ivar decl. block. // rdar://6854840


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@177553 91177308-0d34-0410-b5e6-96231b3b80d8