Trigger postponed jobs on running_ec if that is available #9633
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Currently, any postponed job triggered from a non-ruby thread gets sent to the main thread, but if the main thread is sleeping it won't be checking ints. Instead, we should try and interrupt running_ec if that's possible, and only fall back to the main thread if it's not.
[Bug #20197]
CC @ko1 @jhawthorn does this look OK to you? If not, I outlined a better solution in the linked issue https://bugs.ruby-lang.org/issues/20197