RISC-V LLVM sync-up call 28th October 2021

For background on these calls, see

Reminder: the purpose is to coordinate between active contributors.
If you have support questions etc then it's best to post to llvm-dev.

We have a call every alternate Thursday at 4pm BST (4pm GMT from the
next meeting on Nov 11th), via <https://meet.google.com/ske-zcog-spp&gt;\.
If you have topics to discuss, please email me ahead of time and I can
add them to the agenda.

We have a shared calendar that may help in keeping track, which is
accessible at:
* <https://calendar.google.com/calendar/b/1?cid=bG93cmlzYy5vcmdfMG41cGtlc2ZqY25wMGJoNWhwczFwMGJkODBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ&gt;
* <https://calendar.google.com/calendar/ical/lowrisc.org_0n5pkesfjcnp0bh5hps1p0bd80%40group.calendar.google.com/public/basic.ics&gt;

* Emit CFI directives for function epilogue <Login;
* Generating pseudo instruction li <Login;
* Pre-emit pass to make more instructions compressible
* Lazily add RVV C intrinsics <Login;
* ABI testing for float16 <Login;
* Heads up / other patches to watch
  * TargetLibraryInfo checker tool <Login;
* Next meeting: Nov 11th, 4pm GMT (should be the same local time for
most people, as US+EU will have both changed an hour for daylight