Add new Float32x4 type for SIMD.js.

include/v8-profiler.h

Index: include/v8-profiler.h
diff --git a/include/v8-profiler.h b/include/v8-profiler.h
index 82a14d66003001c6b3ee8afcc7807fed1ecb76dc..d0375a79ec4e20ad63fd94985f36bdcb9506b009 100644
--- a/include/v8-profiler.h
+++ b/include/v8-profiler.h
@@ -275,7 +275,8 @@ class V8_EXPORT HeapGraphNode {
                          // 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). */