Refactor JavaScriptFrame::function() to return a JSFunction* and remove associated casts.

src/runtime-profiler.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 229 matching lines @@
   // (eagerly or lazily).
   JSFunction* samples[kSamplerFrameCount];
   int sample_count = 0;
   int frame_count = 0;
   int frame_count_limit = FLAG_watch_ic_patching ? FLAG_frame_count
                                                  : kSamplerFrameCount;
   for (JavaScriptFrameIterator it(isolate_);
        frame_count++ < frame_count_limit && !it.done();
        it.Advance()) {
     JavaScriptFrame* frame = it.frame();
-    JSFunction* function = JSFunction::cast(frame->function());
+    JSFunction* function = frame->function();
 
     if (!FLAG_watch_ic_patching) {
       // Adjust threshold each time we have processed
       // a certain number of ticks.
       if (sampler_ticks_until_threshold_adjustment_ > 0) {
         sampler_ticks_until_threshold_adjustment_--;
         if (sampler_ticks_until_threshold_adjustment_ <= 0) {
           // If the threshold is not already at the minimum
           // modify and reset the ticks until next adjustment.
           if (sampler_threshold_ > kSamplerThresholdMin) {
@@ skipping 180 matching lines @@
 
 
 void RuntimeProfiler::UpdateSamplesAfterCompact(ObjectVisitor* visitor) {
   for (int i = 0; i < kSamplerWindowSize; i++) {
     visitor->VisitPointer(&sampler_window_[i]);
   }
 }
 
 
 } }  // namespace v8::internal