re PR middle-end/79521 (Bootstrap failure on i686-linux starting with r245436)

	PR middle-end/79521
	* ira-costs.c (scan_one_insn): Check have_regs_of_mode before calling
	ira_init_register_move_cost_if_necessary.

From-SVN: r245500

gcc/ChangeLog

+2017-02-15 Jeff Law  <law@redhat.com>
+
+	PR middle-end/79521
+	* ira-costs.c (scan_one_insn): Check have_regs_of_mode before calling
+	ira_init_register_move_cost_if_necessary.
+
 2017-02-15  Martin Sebor  <msebor@redhat.com>
 
 	PR middle-end/32003

gcc/ira-costs.c

@@ -1452,7 +1452,8 @@ scan_one_insn (rtx_insn *insn)
     {
       rtx x = XEXP (PATTERN (insn), 0);
       if (GET_CODE (x) == REG
-	  && REGNO (x) >= FIRST_PSEUDO_REGISTER)
+	  && REGNO (x) >= FIRST_PSEUDO_REGISTER
+	  && have_regs_of_mode[GET_MODE (x)])
         ira_init_register_move_cost_if_necessary (GET_MODE (x));
       return insn;
     }