We use it a lot in (*Blockchain).IsTxStillRelevant().
name old time/op new time/op delta
IsSignatureContract-8 19.1ns ± 5% 1.2ns ± 4% -93.81% (p=0.000 n=10+10)
name old alloc/op new alloc/op delta
IsSignatureContract-8 0.00B 0.00B ~ (all equal)
name old allocs/op new allocs/op delta
IsSignatureContract-8 0.00 0.00 ~ (all equal)
Turns out C# VM doesn't have it since preview2, so our limiting of
MaxArraySize in incompatible with it. Removing this limit shouldn't be a
problem with the reference counter we have, both APPEND and SETITEM add things
to reference counter and we can't exceed MaxStackSize. PACK on the other hand
can't get more than MaxStackSize-1 of input elements.
Unify NEWSTRUCT with NEWARRAY* and use better integer checks at the same time.
Multisig limit is still 1024.
This allows easier reuse of opcodes and in some cases allows to eliminate
dependencies on the whole vm package, like in compiler that only needs opcodes
and doesn't care about VM for any other purpose.
And yes, they're opcodes because an instruction is a whole thing with
operands, that's what context.Next() returns.
