Revert of Remove SIMD.js from V8.

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index 836d90c3f524a639245cd854b30cc94527d6a84e..ac5dd3a2961e3174f46a0077aa946fec1740aca8 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -2162,6 +2162,12 @@
    * Returns true if this value is a Float64Array.
    */
   bool IsFloat64Array() const;
+
+  /**
+   * Returns true if this value is a SIMD Float32x4.
+   * This is an experimental feature.
+   */
+  bool IsFloat32x4() const;
 
   /**
    * Returns true if this value is a DataView.
@@ -8489,11 +8495,11 @@
   static const int kNodeIsIndependentShift = 3;
   static const int kNodeIsActiveShift = 4;
 
-  static const int kJSApiObjectType = 0xba;
-  static const int kJSObjectType = 0xbb;
+  static const int kJSApiObjectType = 0xbb;
+  static const int kJSObjectType = 0xbc;
   static const int kFirstNonstringType = 0x80;
-  static const int kOddballType = 0x82;
-  static const int kForeignType = 0x86;
+  static const int kOddballType = 0x83;
+  static const int kForeignType = 0x87;
 
   static const int kUndefinedOddballKind = 5;
   static const int kNullOddballKind = 3;