Commits on Jan 19, 2023

1. Fix capnproto#375 (I think) …

   This addresses capnproto#375; the now-deleted comment about the time gap being OK
   has been incorrect at least since we started handling `receiverAnswer`s
   specially; the test that was failing was one where a reference to an
   answer's promise filed (and transitively pcall) is handed to a method
   implementation.
   
   This patch avoids having a gap where pcall & promise are nil by:
   
   - Changing setPipelineCaller so it can be called before we release the
     lock
   - Introducing a stand-in type for the pipeline caller that we can set
     pcall to while the RecvCall is ongoing.
   
   Before fixing the bug it took many thousands or tens of thousands of
   test runs to trigger it, so while I have not been able to reproduce the
   issue after tens of thousands of runs, that alone is inconclusive -- but
   I *think* this fixes the bug. It definitely fixes something.

   

   zenhack committed Jan 19, 2023
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