[og8] Add __builtin_goacc_parlevel_{id,size}

[Cesar Philippidis]

I've committed this patch to og8 which backports the first of Tom's
goacc_parlevel patches from mainline. I'll post of a followup patch
which contains various bug fixes. I believe that this patch was
originally introduced in PR82428, or at least it resolves that PR.

Cesar
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