RISC-V LLVM sync-up call 13th Feb 2020

For background on these calls, see

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

We have a call each Thursday at 4pm GMT, via

I've created a shared calendar which may help in keeping track, which
is accessible at:
  * <https://calendar.google.com/calendar/b/1?cid=bG93cmlzYy5vcmdfMG41cGtlc2ZqY25wMGJoNWhwczFwMGJkODBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ>
  * <https://calendar.google.com/calendar/ical/lowrisc.org_0n5pkesfjcnp0bh5hps1p0bd80%40group.calendar.google.com/public/basic.ics>

The lowRISC team are at an off-site today so we won't be able to
participate as usual, but Ana Pazos has kindly volunteered to run the
meeting. There aren't many submitted topics, so it may be a short one.

Issues to discuss today include the following:
* 10.0 status
  * No outstanding backport requests or regressions we know of.
* Supporting yet-to-be-ratified extensions. Simon's patch has seen new
additions in the past week
* It may be worth discussing [RFC][TableGen/RISCV] Support combining
AssemblerPredicates with ORs https://reviews.llvm.org/D74338
* No other topics were submitted, as always, please do submit things
you'd like to discuss