7025742: Can not use CodeCache::unallocated_capacity() with fragmented CodeCache Summary: Use largest_free_block() instead of unallocated_capacity(). Reviewed-by: iveresov, never, ysr

6965570: assert(!needs_patching && x->is_loaded(),"how do we know it's volatile if it's not loaded") Reviewed-by: iveresov

6589823: Error: meet not symmetric Summary: arrays pointers meet must fall to bottom if exact array klasses in upper lattice are not equal or super klass is exact. Reviewed-by: never

Merge