[ARC] Update can_follow_jump hook helper.

Short branches cannot be used to jump between hot/cold
sections. Update the hook.

gcc/
2017-04-26  Claudiu Zissulescu  <claziss@synopsys.com>

	* config/arc/arc.c (arc_can_follow_jump): Check for short
	branches.

From-SVN: r251566

gcc/ChangeLog

 2017-08-31  Claudiu Zissulescu  <claziss@synopsys.com>
 
+	* config/arc/arc.c (arc_can_follow_jump): Check for short
+	branches.
+
+2017-08-31  Claudiu Zissulescu  <claziss@synopsys.com>
+
 	* config.gcc: Use g.opt for arc.
 	* config/arc/arc.c (LEGITIMATE_SCALED_ADDRESS_P): Deleted,
 	functionality moved to ...

gcc/config/arc/arc.c

@@ -9845,6 +9845,9 @@ arc_can_follow_jump (const rtx_insn *follower, const rtx_insn *followee)
   if (CROSSING_JUMP_P (followee))
     switch (get_attr_type (u.r))
       {
+      case TYPE_BRANCH:
+	if (get_attr_length (u.r) != 2)
+	  break;
       case TYPE_BRCC:
       case TYPE_BRCC_NO_DELAY_SLOT:
 	return false;