tree-ssa-live.c (set_is_used): Return a bool.

tree-ssa-live.c (set_is_used): Return a bool.

	* tree-ssa-live.c (set_is_used): Return a bool.
	(mark_all_vars_used): Don't take data argument.
	(mark_all_vars_used_1): Adjust calls to above, merge handling
	of local and global vars.
	(remove_unused_scope_block_p): Don't take global_unused_vars,
	merge handling of local and global vars.
	(remove_unused_locals): Don't allocate/fill/pass global_unused_vars,
	use is_used_p for local and global vars.

From-SVN: r190080