Fix build and tests error

  1). ASSERT ==> DCHECK
  2). static inline Int32x4* cast(Object* obj);  ==>  DECLARE_CAST(Int32x4)
  3). OS::nan_value() ==> base::OS::nan_value()
  4). change print arguments from StringStream* accumulator to OStream& os
      (Float32x4::Float32x4Print(StringStream* accumulator) ==> Float32x4::Float32x4Print(OStream& os))