missing instructions LWL, LWR, SWL, SWR

[Dylan-Brotherston]

TESTING: LWL
FAILED: LWL
  --> /dev/stdin:12:5
   |
12 |     LWL $t1, label
   |     ^^^^^^^^^^^^^^ unknown instruction `LWL`

TESTING: LWR
FAILED: LWR
  --> /dev/stdin:12:5
   |
12 |     LWR $t1, label
   |     ^^^^^^^^^^^^^^ unknown instruction `LWR`

TESTING: SWL
FAILED: SWL
  --> /dev/stdin:15:5
   |
15 |     SWL $t1, data
   |     ^^^^^^^^^^^^^ unknown instruction `SWL`

TESTING: SWR
FAILED: SWR
  --> /dev/stdin:15:5
   |
15 |     SWR $t1, data
   |     ^^^^^^^^^^^^^ unknown instruction `SWR`

[insou22]

backburner to implement this properly -- state registers [Safe<i32>; 32] --> [[Safe<u8>; 4]; 32], and then deal with this