[PATCH][libstdc++-v3 parallel mode] Get rid of hard-coded ints [was: Re: ints in parallel code]

[Paolo Carlini]

Hi,
> The attached patch should get rid of most hard-coded occurrences of int.
>   
Excellent.
> Tested x86_64-unknown-linux-gnu: No regressions
>
> Please approve for mainline.
>   
Could you please double check for me that the use of _SeqNumber instead
of int, etc, didn't produce overlong lines? Please, don't let me go
through again boring formatting issues ;)

Thanks,
Paolo.