Improve trace_opt output to help find compilation problems

src/ia32/deoptimizer-ia32.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 107 matching lines @@
     JSFunction* function) {
   Isolate* isolate = function->GetIsolate();
   HandleScope scope(isolate);
   AssertNoAllocation no_allocation;
 
   ASSERT(function->IsOptimized());
   ASSERT(function->FunctionsInFunctionListShareSameCode());
 
   // The optimized code is going to be patched, so we cannot use it
   // any more.  Play safe and reset the whole cache.
-  function->shared()->ClearOptimizedCodeMap();
+  function->shared()->ClearOptimizedCodeMap("deoptimized function");
 
   // Get the optimized code.
   Code* code = function->code();
   Address code_start_address = code->instruction_start();
 
   // We will overwrite the code's relocation info in-place. Relocation info
   // is written backward. The relocation info is the payload of a byte
   // array.  Later on we will slide this to the start of the byte array and
   // create a filler object in the remaining space.
   ByteArray* reloc_info = code->relocation_info();
@@ skipping 782 matching lines @@
   }
   __ bind(&done);
 }
 
 #undef __
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32