alloc-pool.c: Include hashtab.h

alloc-pool.c: Include hashtab.h

	* alloc-pool.c: Include hashtab.h
	(alloc_pool_descriptor): New structure
	(alloc_pool_hash): New global variable.
	(hash_descriptor, eq_descriptor, alloc_pool_descriptor): New.
	(create_alloc_pool): Update statistics.
	(free_alloc_pool): Likewise.
	(pool_alloc): Likewise.
	(output_info): New structure
	(print_statistics, dump_alloc_pool_statistics): New function.
	* alloc-pool.h (alloc_pool_def): Turn name to be constant.
	(dump_alloc_pool_statistics): Declare.
	* toplev.c (finalize):  Dump statistics.

From-SVN: r76951