* resource.c (find_basic_block): Use BLOCK_FOR_INSN to look up

	* resource.c (find_basic_block): Use BLOCK_FOR_INSN to look up
	a label's basic block.
	(mark_target_live_regs): Tidy and rework obsolete comments.
	Change back DF problem to LIVE.  If a label starts a basic block,
	assume that all registers that used to be live then still are.
	(init_resource_info): If a label starts a basic block, set its
	BLOCK_FOR_INSN accordingly.
	(fini_resource_info): Undo the setting of BLOCK_FOR_INSN.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@146829 138bc75d-0d04-0410-961f-82ee72b054a4