2012-05-24  Richard Guenther  <rguenther@suse.de>

	PR bootstrap/53466
	* tree-ssa-live.c (remove_unused_scope_block_p): Properly
	handle globals.
	(remove_unused_locals): Pass global_unused_vars to
	remove_unused_scope_block_p.  Restore code walking all
	referenced vars and pruning them.

From-SVN: r187824