Support the following pseudo-ops:
loads:
	ldb	$1,0($1)
	ldbu	$1,0($1)
	ldw	$1,0($1)
	ldwu	$1,0($1)
	uldw	$1,0($1)
	uldwu	$1,0($1)
	uldl	$1,0($1)
	uldq	$1,0($1)
stores:
	stb	$1,0($1)
	stw	$1,0($1)
	ustw	$1,0($1)
	ustl	$1,0($1)
	ustq	$1,0($1)
arith:
	absl	$1,$1
	absq	$1,$1