PR rtl-optimization/49114

	PR rtl-optimization/49114
	* reload.c (struct replacement): Remove SUBREG_LOC member.
	(push_reload): Do not set it.
	(push_replacement): Likewise.
	(subst_reload): Remove dead code.
	(copy_replacements): Remove assertion.
	(copy_replacements_1): Do not handle SUBREG_LOC.
	(move_replacements): Likewise.
	(find_replacement): Remove dead code.  Use reload_adjust_reg_for_mode.
	Detect subregs via recursive descent instead of via SUBREG_LOC.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@175631 138bc75d-0d04-0410-961f-82ee72b054a4