Revert of Remove SIMD.js from V8.

include/v8-profiler.h

Index: include/v8-profiler.h
diff --git a/include/v8-profiler.h b/include/v8-profiler.h
index f7d182f8021e1f51747d3ef3888daf8d79aa33c1..b0a81f2b0b9c0ce5e7f9f3d63327764ac9ae3ff7 100644
--- a/include/v8-profiler.h
+++ b/include/v8-profiler.h
@@ -393,7 +393,8 @@
                          // snapshot items together.
     kConsString = 10,    // Concatenated string. A pair of pointers to strings.
     kSlicedString = 11,  // Sliced string. A fragment of another string.
-    kSymbol = 12         // A Symbol (ES6).
+    kSymbol = 12,        // A Symbol (ES6).
+    kSimdValue = 13      // A SIMD value stored in the heap (Proposed ES7).
   };
 
   /** Returns node type (see HeapGraphNode::Type). */