Delete deadlocking DCHECK for LOS allocation

The DCHECK required acquiring the heap bitmap lock. This lock
may be held by the GC during checkpoint marking. If the GC was
blocked waiting for the allocating thread to run its checkpoint, the
allocating thread would deadlock trying to acquire the heap bitmap
lock.

Bug: 34386492

Test: test-art-host

Change-Id: Idc0bf43cba726c690e578c15bd6373ba0a2c1ecb