[builtins] Add support for JS builtins written in TurboFan.

src/objects.h

 // Copyright 2015 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.
 
 #ifndef V8_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/assert-scope.h"
@@ skipping 5301 matching lines @@
   static const int kGCMetadataOffset = kNextCodeLinkOffset + kPointerSize;
   static const int kInstructionSizeOffset = kGCMetadataOffset + kPointerSize;
   static const int kICAgeOffset = kInstructionSizeOffset + kIntSize;
   static const int kFlagsOffset = kICAgeOffset + kIntSize;
   static const int kKindSpecificFlags1Offset = kFlagsOffset + kIntSize;
   static const int kKindSpecificFlags2Offset =
       kKindSpecificFlags1Offset + kIntSize;
   // Note: We might be able to squeeze this into the flags above.
   static const int kPrologueOffset = kKindSpecificFlags2Offset + kIntSize;
   static const int kConstantPoolOffset = kPrologueOffset + kIntSize;
-  static const int kHeaderPaddingStart =
+  static const int kBuiltinIndexOffset =
       kConstantPoolOffset + kConstantPoolSize;
+  static const int kHeaderPaddingStart = kBuiltinIndexOffset + kIntSize;
 
   // Add padding to align the instruction start following right after
   // the Code object header.
   static const int kHeaderSize =
       (kHeaderPaddingStart + kCodeAlignmentMask) & ~kCodeAlignmentMask;
 
   class BodyDescriptor;
 
   // Byte offsets within kKindSpecificFlags1Offset.
   static const int kFullCodeFlags = kKindSpecificFlags1Offset;
   class FullCodeFlagsHasDeoptimizationSupportField:
       public BitField<bool, 0, 1> {};  // NOLINT
   class FullCodeFlagsHasDebugBreakSlotsField: public BitField<bool, 1, 1> {};
   class FullCodeFlagsHasRelocInfoForSerialization
       : public BitField<bool, 2, 1> {};
   // Bit 3 in this bitfield is unused.
   class ProfilerTicksField : public BitField<int, 4, 28> {};
 
   // Flags layout.  BitField<type, shift, size>.
   class ICStateField : public BitField<InlineCacheState, 0, 3> {};
   class TypeField : public BitField<StubType, 3, 1> {};
   class CacheHolderField : public BitField<CacheHolderFlag, 4, 2> {};
   class KindField : public BitField<Kind, 6, 5> {};
   class ExtraICStateField
       : public BitField<ExtraICState, 11, PlatformSmiTagging::kSmiValueSize -
                                               11 + 1> {};  // NOLINT
 
-  // KindSpecificFlags1 layout (STUB and OPTIMIZED_FUNCTION)
+  // KindSpecificFlags1 layout (STUB, BUILTIN and OPTIMIZED_FUNCTION)
   static const int kStackSlotsFirstBit = 0;
   static const int kStackSlotsBitCount = 24;
   static const int kMarkedForDeoptimizationBit =
       kStackSlotsFirstBit + kStackSlotsBitCount;
   static const int kIsTurbofannedBit = kMarkedForDeoptimizationBit + 1;
   static const int kCanHaveWeakObjects = kIsTurbofannedBit + 1;
 
   STATIC_ASSERT(kStackSlotsFirstBit + kStackSlotsBitCount <= 32);
   STATIC_ASSERT(kCanHaveWeakObjects + 1 <= 32);
 
@@ skipping 5534 matching lines @@
     }
     return value;
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #endif  // V8_OBJECTS_H_