Improve trace_opt output to help find compilation problems

src/runtime.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 7986 matching lines @@
     if (FLAG_trace_deopt) {
       PrintF("[removing optimized code for: ");
       function->PrintName();
       PrintF("]\n");
     }
     function->ReplaceCode(function->shared()->code());
   } else {
     Deoptimizer::DeoptimizeFunction(*function);
   }
   // Flush optimized code cache for this function.
-  function->shared()->ClearOptimizedCodeMap();
+  function->shared()->ClearOptimizedCodeMap("notify deoptimized");
 
   return isolate->heap()->undefined_value();
 }
 
 
 RUNTIME_FUNCTION(MaybeObject*, Runtime_NotifyOSR) {
   NoHandleAllocation ha(isolate);
   Deoptimizer* deoptimizer = Deoptimizer::Grab(isolate);
   delete deoptimizer;
   return isolate->heap()->undefined_value();
@@ skipping 5479 matching lines @@
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     isolate->counters()->gc_last_resort_from_js()->Increment();
     isolate->heap()->CollectAllGarbage(Heap::kNoGCFlags,
                                        "Runtime::PerformGC");
   }
 }
 
 
 } }  // namespace v8::internal