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Draft: WIP rts: exclude idle threads from n_gc_threads

Douglas Wilson requested to merge wip/no-anywork-more-idle into wip/no-anywork

This MR is targeting the branch for #4619. This is my attempt to get CI to build it, without putting it in that branch yet. Please do lmk if this is abuse of CI

This adds a bool field to the gc_thread struct, idle. See comment in gcWorkerThread.

all for (int i = 0; i < n_gc_threads; ++i) loops are changed to use n_capabilities, and n_gc_threads is set to n_capabilities - num_idle_caps.

Rather than wire the idle_caps array around to more places, it seems better to put this in gc_thread

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