re PR middle-end/15855 (g++ crash with -O2 and -O3 on input file)

2005-09-26  Richard Guenther  <rguenther@suse.de>

	PR middle-end/15855
	* gcse.c: Include hashtab.h, define ldst entry hashtable.
	(pre_ldst_expr_hash, pre_ldst_expr_eq): New functions.
	(ldst_entry): Use the hashtable instead of list-walking.
	(find_rtx_in_ldst): Likewise.
	(free_ldst_entry): Free the hashtable.
	(compute_ld_motion_mems): Create the hashtable.
	(trim_ld_motion_mems): Remove entry from hashtable if
	removing it from list.
	(compute_store_table): Likewise^2.
	(store_motion): Free hashtable in case we did not see
	any stores.

From-SVN: r104641