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 3548dd6f8eb70384ecc3bd671a54de11fd3d2a0d..6c13a5e732bc8b24b6b34947caf2528c7ac35398 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;
@@ -214,6 +217,9 @@ void HeapNumber::HeapNumberVerify() {
 }
 
 
+void Float32x4::Float32x4Verify() { CHECK(IsFloat32x4()); }
+
+
 void ByteArray::ByteArrayVerify() {
   CHECK(IsByteArray());
 }