reload1.c (choose_reload_regs): If using an equivalence from find_equiv_reg and reg_reloaded_valid is not set...

	* reload1.c (choose_reload_regs): If using an equivalence from
	find_equiv_reg and reg_reloaded_valid is not set for this register,
	clear the associated spill_reg_store.

From-SVN: r21035