(NEG (MOVDconst [c])) => (MOVDconst [-c])
(MOVBreg  (MOVDconst [c])) => (MOVDconst [int64(int8(c))])
(MOVBUreg (MOVDconst [c])) => (MOVDconst [int64(uint8(c))])
(MOVHreg  (MOVDconst [c])) => (MOVDconst [int64(int16(c))])
(MOVHUreg (MOVDconst [c])) => (MOVDconst [int64(uint16(c))])
(MOVWreg  (MOVDconst [c])) => (MOVDconst [int64(int32(c))])
(MOVWUreg (MOVDconst [c])) => (MOVDconst [int64(uint32(c))])

    This operation reverses each dimension i for
    which there exists j s.t. axis[j] == i.

    Args:
      tensor: A Tensor. Must be one of the following types:
      uint8, int8, int16, int32, int64, float32, bool Up to 8-D.

      axis: A Tensor. Must be one of the following types: int32, int64.
      with only 1 element which is the axis index.
      TODO: Add support for multiple elements.
  }];