* reload.c (reload_inner_reg_of_subreg): Change type of return value

	* reload.c (reload_inner_reg_of_subreg): Change type of return value
	and type of OUTPUT parameter to bool and adjust.  Document MODE and
	OUTPUT parameters.  Use HARD_REGISTER_P.  Reorder final condition
	and improve associated comment.
	(push_reload): Clarify and update comments about reloading of subregs.
	Adjust calls to reload_inner_reg_of_subreg.  Compute the class upfront
	for the reloading of subregs in the out case as well.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@180526 138bc75d-0d04-0410-961f-82ee72b054a4