This patch adds support for PLB invalidate operation (PLBI) instruction
and the corresponding system registers as operand (<plbi_op>).
Syntax: PLBI <plbi_op>{, <Xt>}
This instruction is an alias to "SYS #<op1>, C10, <Cm>, #<op2>{, <Xt>}"
and PLBI being the preferred disassembly.
The following list of system registers are supported in this patch for the
PLBI instructions enabled by "+poe2" flag and also the "nxs" variants of
these system registers are enabled by "+poe2+xs" flag.
* alle1
* alle1is
* alle1os
* alle2
* alle2is
* alle2os
* alle3
* alle3is
* alle3os
* aside1
* aside1is
* aside1os
* permae1
* permae1is
* permae1os
* perme1
* perme1is
* perme1os
* perme2
* perme2is
* perme2os
* perme3
* perme3is
* perme3os
* vmalle1
* vmalle1is
* vmalle1os
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