2009-08-06  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/40964
	* tree.c (iterative_hash_host_wide_int): Export.
	* tree.h (iterative_hash_host_wide_int): Declare.
	* tree-ssa-structalias.c (heapvar_map): New struct.
	(heapvar_map_eq): New function.
	(heapvar_map_hash): Likewise.
	(heapvar_lookup): Adjust.
	(heapvar_insert): Likewise.
	(make_constraint_from_heapvar): Allow multiple heap variables
	per decl at different offsets.
	(init_alias_heapvars): Adjust.

	* gcc.c-torture/compile/pr40964.c: New testcase.

From-SVN: r150517