[analyzer] ObjCDeallocChecker: Only operate on classes with retained properties.

Previously the ObjC Dealloc Checker only checked classes with ivars, not
retained properties, which caused three bugs:

- False positive warnings about a missing -dealloc method in classes with only
ivars.
- Missing warnings about a missing -dealloc method on classes with only
properties.
- Missing warnings about an over-released or under-released ivar associated with
a retained property in classes with only properties.

The fix is to check only classes with at least one retained synthesized
property.

This also exposed a bug when reporting an over-released or under-released
property that did not contain a synthesize statement. The checker tried to
associate the warning with an @synthesize statement that did not exist, which
caused an assertion failure in debug builds. The fix is to fall back to the
@property statement in this case.

A patch by David Kilzer!

Part of rdar://problem/6927496

Differential Revision: http://reviews.llvm.org/D5023

llvm-svn: 258896