Macro x86_64::software_interrupt

macro_rules! software_interrupt {
    ($x : expr) => { ... };
}

This is supported on crate features nightly or inline_asm only.

Generate a software interrupt by invoking the int instruction.

This currently needs to be a macro because the int argument needs to be an immediate. This macro will be replaced by a generic function when support for const generics is implemented in Rust.