Fix printf formatting.

src/gc-tracer.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/gc-tracer.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 262 matching lines @@
   PrintF("promotion_rate=%.1f%% ", heap_->promotion_rate_);
   PrintF("semi_space_copy_rate=%.1f%% ", heap_->semi_space_copied_rate_);
 
   if (current_.type == Event::SCAVENGER) {
     PrintF("steps_count=%d ", current_.incremental_marking_steps);
     PrintF("steps_took=%.1f ", current_.incremental_marking_duration);
   } else {
     PrintF("steps_count=%d ", current_.incremental_marking_steps);
     PrintF("steps_took=%.1f ", current_.incremental_marking_duration);
     PrintF("longest_step=%.1f ", current_.longest_incremental_marking_step);
-    PrintF("marking_throughput=%d\n", MarkingSpeedInBytesPerMillisecond());
+    PrintF("marking_throughput=%" V8_PTR_PREFIX "d ",
+           MarkingSpeedInBytesPerMillisecond());
   }
 
   PrintF("\n");
 }
 
 
 double GCTracer::MeanDuration(const EventBuffer& events) const {
   if (events.empty()) return 0.0;
 
   double mean = 0.0;
@@ skipping 78 matching lines @@
     durations += iter->incremental_marking_duration;
     ++iter;
   }
 
   if (durations == 0.0) return 0;
 
   return static_cast<intptr_t>(bytes / durations);
 }
 }
 }  // namespace v8::internal