Add a GNU parallel runner
Created attachment 404345 [details] Patch
Created attachment 404347 [details] Patch
Created attachment 404434 [details] Patch
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Created attachment 404570 [details] Patch
<rdar://problem/65938547>
Comment on attachment 404570 [details] Patch r=me I don't know enough about GNU parallel to review the commands your calling but it seems reasonable.
Committed r264813: <https://trac.webkit.org/changeset/264813> All reviewed patches have been landed. Closing bug and clearing flags on attachment 404570 [details].