Change remaining release calls to autorelease in Unsafe.java.
Change remaining release calls to autorelease in Unsafe.java.

This fixes a crash in ConcurrentLinkedQueue. updateHead() calls casHead(), which
calls Unsafe.compareAndSwapObject(), which may release the only reference to
head. updateHead() still has a local unretained reference to head, and further
access to that reference will crash.
	Change on 2014/04/04 by iroth <iroth@google.com>
-------------
Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=64384855

ZouQingcang/MyProject,csripada/j2objc,hambroperks/j2objc,gank0326/j2objc,Sellegit/j2objc,csripada/j2objc,gank0326/j2objc,hambroperks/j2objc,jiachenning/j2objc,hambroperks/j2objc,Sellegit/j2objc,jiachenning/j2objc,ZouQingcang/MyProject,csripada/j2objc,ZouQingcang/MyProject,hambroperks/j2objc,jiachenning/j2objc,ZouQingcang/MyProject,hambroperks/j2objc,jiachenning/j2objc,ZouQingcang/MyProject,Sellegit/j2objc,gank0326/j2objc,gank0326/j2objc,hambroperks/j2objc,Sellegit/j2objc,gank0326/j2objc,jiachenning/j2objc,Sellegit/j2objc,hambroperks/j2objc