Explicitly initialize Code::builtin_index

src/factory.cc

 // Copyright 2014 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/factory.h"
 
 #include "src/accessors.h"
 #include "src/allocation-site-scopes.h"
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
@@ skipping 1425 matching lines @@
   code->set_raw_kind_specific_flags1(0);
   code->set_raw_kind_specific_flags2(0);
   code->set_is_crankshafted(crankshafted);
   code->set_deoptimization_data(*empty_fixed_array(), SKIP_WRITE_BARRIER);
   code->set_raw_type_feedback_info(Smi::FromInt(0));
   code->set_next_code_link(*undefined_value(), SKIP_WRITE_BARRIER);
   code->set_handler_table(*empty_fixed_array(), SKIP_WRITE_BARRIER);
   code->set_source_position_table(*empty_byte_array(), SKIP_WRITE_BARRIER);
   code->set_prologue_offset(prologue_offset);
   code->set_constant_pool_offset(desc.instr_size - desc.constant_pool_size);
+  code->set_builtin_index(-1);
 
   if (code->kind() == Code::OPTIMIZED_FUNCTION) {
     code->set_marked_for_deoptimization(false);
   }
 
   if (is_debug) {
     DCHECK(code->kind() == Code::FUNCTION);
     code->set_has_debug_break_slots(true);
   }
 
@@ skipping 1035 matching lines @@
     Handle<AccessorInfo> prototype =
         Accessors::FunctionPrototypeInfo(isolate(), attribs);
     AccessorConstantDescriptor d(Handle<Name>(Name::cast(prototype->name())),
                                  prototype, attribs);
     map->AppendDescriptor(&d);
   }
 }
 
 }  // namespace internal
 }  // namespace v8