do not collect cold loops in scops

           * graphite-scop-detection.c (loop_is_valid_scop): Call
           optimize_loop_nest_for_speed_p.

Co-Authored-By: Sebastian Pop <s.pop@samsung.com>

From-SVN: r229890

gcc/ChangeLog

 2015-11-06  Aditya Kumar  <aditya.k7@samsung.com>
 	    Sebastian Pop  <s.pop@samsung.com>
 
+	* graphite-scop-detection.c (loop_is_valid_scop): Call
+	optimize_loop_nest_for_speed_p.
+
+2015-11-06  Aditya Kumar  <aditya.k7@samsung.com>
+	    Sebastian Pop  <s.pop@samsung.com>
+
 	* graphite-optimize-isl.c (optimize_isl): Call
 	isl_options_set_schedule_maximize_band_depth.
 

gcc/graphite-scop-detection.c

@@ -959,6 +959,13 @@ scop_detection::loop_is_valid_scop (loop_p loop, sese_l scop) const
   if (!scop)
     return false;
 
+  if (!optimize_loop_nest_for_speed_p (loop))
+    {
+      DEBUG_PRINT (dp << "[scop-detection-fail] loop_"
+		      << loop->num << " is not on a hot path.\n");
+      return false;
+    }
+
   if (!can_represent_loop (loop, scop))
     {
       DEBUG_PRINT (dp << "[scop-detection-fail] cannot represent loop_"