Add new Float32x4 type for SIMD.js.

src/objects-debug.cc

Index: src/objects-debug.cc
diff --git a/src/objects-debug.cc b/src/objects-debug.cc
index 55fc138cf0f7116a8baf6c25e4df1496f9a3fdb8..635bd6140ee177ecd7d4fdd77775971f33a99b67 100644
--- a/src/objects-debug.cc
+++ b/src/objects-debug.cc
@@ -58,6 +58,9 @@ void HeapObject::HeapObjectVerify() {
     case MUTABLE_HEAP_NUMBER_TYPE:
       HeapNumber::cast(this)->HeapNumberVerify();
       break;
+    case FLOAT32X4_TYPE:
+      Float32x4::cast(this)->Float32x4Verify();
+      break;
     case FIXED_ARRAY_TYPE:
       FixedArray::cast(this)->FixedArrayVerify();
       break;
@@ -211,6 +214,9 @@ void HeapNumber::HeapNumberVerify() {
 }
 
 
+void Float32x4::Float32x4Verify() { CHECK(IsFloat32x4()); }
+
+
 void ByteArray::ByteArrayVerify() {
   CHECK(IsByteArray());
 }