re PR rtl-optimization/33638 (wrong code with -O2 -fforce-addr)

re PR rtl-optimization/33638 (wrong code with -O2 -fforce-addr)

	PR rtl-optimization/33638
	* dse.c (struct insn_info): Remove 'stack_read' field,
	add 'stack_pointer_based' field.
	(record_store): For a store with non-constant base, record
	whether it is stack pointer based.
	(scan_insn): For the call to a const function, remove stack
	pointer based stores from the list of local active stores.
	(scan_reads_nospill): Delete code dealing with const functions.

From-SVN: r129226