Issue #697

* Trim informs the array that it is now only nelts long * as far as the client is concerned. This may trigger * shrinking of the array.

No forwarding here due to aliasing/name mangling issues

Put a superblock on this heap.

For direct MMAP, use MEM_TOP_DOWN to minimize interference */

Win32 MMAP via VirtualAlloc */

This function supports releasing coalesed segments */

Custom spin locks for older gcc on x86 */

* @brief Delete one reference to the unique heap. * When the number of references goes to zero, * delete the super heap. */