2012-04-27  Richard Guenther  <rguenther@suse.de>

	* tree-flow.h (is_hidden_global_store): Remove.
	* tree-ssa-sink.c (is_hidden_global_store): Likewise.
	* tree-ssa-alias.h (ref_may_alias_global_p): Declare.
	(stmt_may_clobber_global_p): Likewise.
	* tree-ssa-alias.c (ref_may_alias_global_p): New function.
	(stmt_may_clobber_global_p): Likewise.
	* tree-ssa-dce.c (mark_stmt_if_obviously_necessary): Call
	stmt_may_clobber_global_p.
	* tree-ssa-dse.c (dse_possible_dead_store_p): Likewise.

From-SVN: r186903