Fallible Instruction::virtual_address (#104)
Fallible Instruction::virtual_address (#104)

* Add variant of virtual_address allowing unsupported registers

* Relax callback type constraint

There's no specific requirement for this closure not to mutate its
environment.
0xd4d/iced,0xd4d/iced,0xd4d/iced,0xd4d/iced,0xd4d/iced