2009-05-24  Paolo Bonzini  <bonzini@gnu.org>

	* tree-ssa-operands.h (push_stmt_changes, pop_stmt_changes,
	discard_stmt_changes): Delete.
	* tree-ssa-operands.c (scb_stack): Delete.
	(init_ssa_operands): Do not initialize it.
	(fini_ssa_operands): Do not free it.
	(push_stmt_changes, pop_stmt_changes, discard_stmt_changes): Delete.

	* tree-cfg.c (replace_uses_by): Replace pop_stmt_changes with 
	update_stmt, remove the others.  Fix comments.
	* tree-dfa.c (optimize_stack_restore): Likewise.
	* tree-ssa-forwprop.c (forward_propagate_addr_expr): Likewise.
	* tree-ssa-loop-ivopts.c (rewrite_use): Likewise.
	* tree-ssa-dce.c (eliminate_unnecessary_stmts): Likewise.
	* tree-ssa-ccp.c (optimize_stack_restore, execute_fold_all_builtins):
	Likewise.
	* tree-ssa-propagate.c (substitute_and_fold): Likewise.
	* tree-ssa-dom.c (propagate_rhs_into_lhs): Likewise.
	(dom_opt_finalize_block): Likewise, adjusting access to stmts_to_rescan.
	(optimize_stmt): Likewise, adjusting access to stmts_to_rescan.
	(stmts_to_rescan): Change item type to gimple.
	(tree_ssa_dominator_optimize): Change type of stmts_to_rescan.

From-SVN: r147831