Show builtin name when printing Code objects.

src/objects.cc

 // Copyright 2013 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/objects.h"
 
 #include <cmath>
 #include <iomanip>
 #include <sstream>
 
@@ skipping 13296 matching lines @@
       DCHECK(CodeStub::GetMajorKey(this) == CodeStub::CompareIC);
       CompareICStub stub(stub_key(), GetIsolate());
       os << "compare_state = " << CompareICState::GetStateName(stub.left())
          << "*" << CompareICState::GetStateName(stub.right()) << " -> "
          << CompareICState::GetStateName(stub.state()) << "\n";
       os << "compare_operation = " << Token::Name(stub.op()) << "\n";
     }
   }
   if ((name != NULL) && (name[0] != '\0')) {
     os << "name = " << name << "\n";
+  } else if (kind() == BUILTIN) {
+    name = GetIsolate()->builtins()->Lookup(instruction_start());
+    if (name != NULL) {
+      os << "name = " << name << "\n";
+    }
   }
   if (kind() == OPTIMIZED_FUNCTION) {
     os << "stack_slots = " << stack_slots() << "\n";
   }
   os << "compiler = " << (is_turbofanned()
                               ? "turbofan"
                               : is_crankshafted() ? "crankshaft"
                                                   : kind() == Code::FUNCTION
                                                         ? "full-codegen"
                                                         : "unknown") << "\n";
@@ skipping 4505 matching lines @@
   if (cell->value() != *new_value) {
     cell->set_value(*new_value);
     Isolate* isolate = cell->GetIsolate();
     cell->dependent_code()->DeoptimizeDependentCodeGroup(
         isolate, DependentCode::kPropertyCellChangedGroup);
   }
 }
 
 }  // namespace internal
 }  // namespace v8