get_integer vtable usage from List.gimme

codegen

# Perl 6 code:

        my $eager = nqp::p6bool(nqp::istype($n, Whatever) || $n == $Inf);
        while $!nextiter.defined && ($eager 
                                       ?? !$!nextiter.infinite 
                                       !! ($count < $n)) {

# generate PIR:

    nqp_get_sc_object $P509, "F86B277741A9A72C5FDE64CEE158DEF895454515", 7
    type_check $I501, $P13, $P509
    perl6_box_int $P515, $I501
    set $P514, $P515
    if $I501 goto unless1300_end4106 
    find_lex $P512, "$Inf"
    find_lex $P511, "&infix:<==>"
    perl6_multi_dispatch_thunk $P510, $P511
    $P513 = $P510($P13, $P512)
    set $P514, $P513
  unless1300_end4106:
    set $I502, $P514                      # vtable call
    perl6_booleanize $P508, $I502
    perl6_container_store $P17, $P508