* reload1.c (reload): Make all entries in reg_equiv_memory_loc

	unshared.
	* reload.c (make_memloc): Copy result if it is still
	reg_equiv_memory_loc[regno] on return.
	(subst_reloads) [ENABLE_CHECKING]: Check that none of
	reg_equiv_constant, reg_equiv_memory_loc, reg_equiv_address and
	reg_equiv_mem are modified by the substitutions.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@45177 138bc75d-0d04-0410-961f-82ee72b054a4