Revert of Remove SIMD.js from V8.

src/objects-debug.cc

Index: src/objects-debug.cc
diff --git a/src/objects-debug.cc b/src/objects-debug.cc
index 060f0b03e258dd05dcc3b9ddf033b308747b7577..bc60bbaabdde53fe9fa310bc541c0407feb2d538 100644
--- a/src/objects-debug.cc
+++ b/src/objects-debug.cc
@@ -63,6 +63,9 @@
     case HEAP_NUMBER_TYPE:
     case MUTABLE_HEAP_NUMBER_TYPE:
       HeapNumber::cast(this)->HeapNumberVerify();
+      break;
+    case SIMD128_VALUE_TYPE:
+      Simd128Value::cast(this)->Simd128ValueVerify();
       break;
     case FIXED_ARRAY_TYPE:
       FixedArray::cast(this)->FixedArrayVerify();
@@ -266,6 +269,10 @@
   CHECK(IsHeapNumber() || IsMutableHeapNumber());
 }
 
+
+void Simd128Value::Simd128ValueVerify() { CHECK(IsSimd128Value()); }
+
+
 void ByteArray::ByteArrayVerify() {
   CHECK(IsByteArray());
 }