Objective-C: Fixes an ivar lookup bug where
'ivar' was used inside a record/union used 
as argument to __typeof. // rdar14037151 pr5984


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@183048 91177308-0d34-0410-b5e6-96231b3b80d8