Please add The miscellaneous-instruction-extensions facility 4

[salva-rczero]

Hi, I'm working in the "The miscellaneous-instruction-extensions facility 4".
Can you add the new instructions:

* CLZG    B968  [RRE] COUNT LEADING ZEROS
* CTZG    B969  [RRE] COUNT TRAILING ZEROS
* BEXTG   B96C  [RRF-a] BIT EXTRACT
* BDEPG   B96D  [RRF-a] BIT DEPOSIT
* LXAB    E360  [RXY-c] LOAD INDEXED ADDRESS (shift left 0)
* LLXAB   E361  [RXY-c] LOAD LOGICAL INDEXED ADDRESS (shift left 0)
* LXAH    E362  [RXY-c] LOAD INDEXED ADDRESS (shift left 1)
* LLXAH   E363  [RXY-c] LOAD LOGICAL INDEXED ADDRESS (shift left 1)
* LXAF    E364  [RXY-c] LOAD INDEXED ADDRESS (shift left 2)
* LLXAF   E365  [RXY-c] LOAD LOGICAL INDEXED ADDRESS (shift left 2)
* LXAG    E366  [RXY-c] LOAD INDEXED ADDRESS (shift left 3)
* LLXAG   E367  [RXY-c] LOAD LOGICAL INDEXED ADDRESS (shift left 3)
* LXAQ    E368  [RXY-c] LOAD INDEXED ADDRESS (shift left 4)
* LLXAQ   E369  [RXY-c] LOAD LOGICAL INDEXED ADDRESS (shift left 4)

There is a new format, RXY-c, but I think it's the same as RXY-a for assembler point of view.

Thanks, salva.