Meaningful name for builtins in JitCodeEvent API.

src/log.cc

 // Copyright 2011 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/log.h"
 
 #include <cstdarg>
 #include <sstream>
 
 #include "src/v8.h"
@@ skipping 1592 matching lines @@
           CodeStub::MajorName(CodeStub::GetMajorKey(code_object), true);
       if (description == NULL)
         description = "A stub from the snapshot";
       tag = Logger::STUB_TAG;
       break;
     case Code::REGEXP:
       description = "Regular expression code";
       tag = Logger::REG_EXP_TAG;
       break;
     case Code::BUILTIN:
-      description = "A builtin from the snapshot";
+      description = isolate_->builtins()->name(code_object->builtin_index());
       tag = Logger::BUILTIN_TAG;
       break;
     case Code::HANDLER:
       description = "An IC handler from the snapshot";
       tag = Logger::HANDLER_TAG;
       break;
     case Code::KEYED_LOAD_IC:
       description = "A keyed load IC from the snapshot";
       tag = Logger::KEYED_LOAD_IC_TAG;
       break;
@@ skipping 271 matching lines @@
     removeCodeEventListener(jit_logger_);
     delete jit_logger_;
     jit_logger_ = NULL;
   }
 
   return log_->Close();
 }
 
 }  // namespace internal
 }  // namespace v8