Function jit_block_current_is_dead 

pub unsafe extern "C" fn jit_block_current_is_dead(
    func: jit_function_t,
) -> c_int

Determine if the current point in the function is dead. That is, there are no existing branches or fall-throughs to this point. This differs slightly from jit_block_ends_in_dead in that this can skip past zero-length blocks that may not appear to be dead to find the dead block at the head of a chain of empty blocks.