[Libre-soc-dev] pysvp64asm: opcode setvli not supported

[Luke Kenneth Casson Leighton]

this is a scalar 32 bit instruction not a 64 bit prefixed one.

we could have used (32 bit) MTSPR instead to set SVSTATE but that way is messy.

setvl shouuuuld be translated to a .long because it is not part of
v3.0B not supported by gas.

oh wait... err... did i add that? i can't remember.  i will have to
check. see if i added a unit test.

will do this evening, on middle of conference ICS2021

l.