Revert of Remove SIMD.js from V8.

src/objects-body-descriptors-inl.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_BODY_DESCRIPTORS_INL_H_
 #define V8_OBJECTS_BODY_DESCRIPTORS_INL_H_
 
 #include "src/objects-body-descriptors.h"
 
 namespace v8 {
@@ skipping 537 matching lines @@
       return Op::template apply<PropertyCell::BodyDescriptor>(p1, p2, p3);
     case WEAK_CELL_TYPE:
       return Op::template apply<WeakCell::BodyDescriptor>(p1, p2, p3);
     case SYMBOL_TYPE:
       return Op::template apply<Symbol::BodyDescriptor>(p1, p2, p3);
     case BYTECODE_ARRAY_TYPE:
       return Op::template apply<BytecodeArray::BodyDescriptor>(p1, p2, p3);
 
     case HEAP_NUMBER_TYPE:
     case MUTABLE_HEAP_NUMBER_TYPE:
+    case SIMD128_VALUE_TYPE:
     case FILLER_TYPE:
     case BYTE_ARRAY_TYPE:
     case FREE_SPACE_TYPE:
       return ReturnType();
 
 #define TYPED_ARRAY_CASE(Type, type, TYPE, ctype, size) \
   case FIXED_##TYPE##_ARRAY_TYPE:                       \
     return Op::template apply<FixedTypedArrayBase::BodyDescriptor>(p1, p2, p3);
       TYPED_ARRAYS(TYPED_ARRAY_CASE)
 #undef TYPED_ARRAY_CASE
@@ skipping 41 matching lines @@
 
 template <typename ObjectVisitor>
 void HeapObject::IterateBodyFast(InstanceType type, int object_size,
                                  ObjectVisitor* v) {
   BodyDescriptorApply<CallIterateBody, void>(type, this, object_size, v);
 }
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_OBJECTS_BODY_DESCRIPTORS_INL_H_