Add MPX instructions (discontinued)

[mazegen]

Discontinued instruction extension, low priority.

https://en.wikipedia.org/wiki/Intel_MPX
https://linasm.sourceforge.net/docs/instructions/mpx.php

List:

BNDMK	Create a LowerBound and a UpperBound in a register
BNDCL	Check the address of a memory reference against a LowerBound
BNDCU	Check the address of a memory reference against an UpperBound in 1’s compliment form
BNDCN	Check the address of a memory reference against an UpperBound not in 1’s compliment form
BNDMOV	Load from memory or store to memory of the LowerBound and UpperBound to a register or from a register
BNDLDX	Load bounds using address translation
BNDSTX	Store bounds using address translation