Fix i386 being able to show member variables correctly by not returning empty...

Fix i386 being able to show member variables correctly by not returning empty objective C types from the runtime.

We don't parse ObjC v1 types from the runtime metadata like we do for ObjC v2, but doing so by creating empty types was ruining the i386 v1 debugging experience.

<rdar://problem/24093343>

llvm-svn: 289233