Store builtin index on the builtin code object.

src/objects-inl.h

 // Copyright 2012 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.
 //
 // Review notes:
 //
 // - The use of macros in these inline functions may seem superfluous
 // but it is absolutely needed to make sure gcc generates optimal
 // code. gcc is not happy when attempting to inline too deep.
 //
@@ skipping 4782 matching lines @@
 }
 
 
 void Code::set_profiler_ticks(int ticks) {
   ASSERT_EQ(FUNCTION, kind());
   ASSERT(ticks < 256);
   WRITE_BYTE_FIELD(this, kProfilerTicksOffset, ticks);
 }
 
 
+int Code::builtin_index() {
+  ASSERT_EQ(BUILTIN, kind());
+  return READ_INT32_FIELD(this, kKindSpecificFlags1Offset);
+}
+
+
+void Code::set_builtin_index(int index) {
+  ASSERT_EQ(BUILTIN, kind());
+  WRITE_INT32_FIELD(this, kKindSpecificFlags1Offset, index);
+}
+
+
 unsigned Code::stack_slots() {
   ASSERT(is_crankshafted());
   return StackSlotsField::decode(
       READ_UINT32_FIELD(this, kKindSpecificFlags1Offset));
 }
 
 
 void Code::set_stack_slots(unsigned slots) {
   CHECK(slots <= (1 << kStackSlotsBitCount));
   ASSERT(is_crankshafted());
@@ skipping 2356 matching lines @@
 #undef READ_SHORT_FIELD
 #undef WRITE_SHORT_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 #undef NOBARRIER_READ_BYTE_FIELD
 #undef NOBARRIER_WRITE_BYTE_FIELD
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_INL_H_