Revert of Remove SIMD.js from V8.

src/json-stringifier.cc

 // Copyright 2016 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/json-stringifier.h"
 
 #include "src/conversions.h"
 #include "src/lookup.h"
 #include "src/messages.h"
 #include "src/objects-inl.h"
@@ skipping 305 matching lines @@
           return SUCCESS;
         default:
           return UNCHANGED;
       }
     case JS_ARRAY_TYPE:
       if (deferred_string_key) SerializeDeferredKey(comma, key);
       return SerializeJSArray(Handle<JSArray>::cast(object));
     case JS_VALUE_TYPE:
       if (deferred_string_key) SerializeDeferredKey(comma, key);
       return SerializeJSValue(Handle<JSValue>::cast(object));
+    case SIMD128_VALUE_TYPE:
     case SYMBOL_TYPE:
       return UNCHANGED;
     default:
       if (object->IsString()) {
         if (deferred_string_key) SerializeDeferredKey(comma, key);
         SerializeString(Handle<String>::cast(object));
         return SUCCESS;
       } else {
         DCHECK(object->IsJSReceiver());
         if (object->IsCallable()) return UNCHANGED;
@@ skipping 377 matching lines @@
     if (object->IsOneByteRepresentationUnderneath()) {
       SerializeString_<uint8_t, uc16>(object);
     } else {
       SerializeString_<uc16, uc16>(object);
     }
   }
 }
 
 }  // namespace internal
 }  // namespace v8