Set pre_main status before launching run_helper #3198
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This fixes a race where `runtime_impl::run_helper` could set the runtime status to `running` before `runtime_impl::start` sets the status to `pre_main` (the status would then be stuck at `pre_main` instead of `running` after actually starting the runtime).
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This fixes a race where
runtime_impl::run_helpercould set the runtime status torunningbeforeruntime_impl::startsets the status topre_main(the status would then be stuck atpre_maininstead ofrunningafter actually starting the runtime).