Fix crash-on-invalid in objc super property access

[Jason Haslam]

The attached patch fixes PR21932. It’s a crash-on-invalid for cases like this:

@implementation IFaceNotFound (Foo)
-(int) foo {
  return super.foo;
}
@end

Jason

-------------- next part --------------
A non-text attachment was scrubbed...
Name: objc-super-prop-crash-on-invalid.patch
Type: application/octet-stream
Size: 3175 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/cfe-commits/attachments/20150119/5ce346ab/attachment.obj>