Function instruction_event 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn instruction_event(
    drcontext: *mut c_void,
    _tag: *mut c_void,
    bb: *mut instrlist_t,
    instr: *mut instr_t,
    _for_trace: bool_,
    _translating: bool_,
    _user_data: *mut c_void,
) -> dr_emit_flags_t