PR rtl-optimization/17933

	* rtlanal.c (dead_or_set_regno_p): Break out common code to...
	(covers_regno_p): New function.  Handle SETs of PARALLEL,
	and defer the rest to...
	(covers_regno_no_parallel_p): New function.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@90183 138bc75d-0d04-0410-961f-82ee72b054a4