RISC-V LLVM sync-up call 23 Apr 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 BST, 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>

Issues to discuss today include the following:
* 10.0.1 - schedule now announced.
http://lists.llvm.org/pipermail/llvm-dev/2020-April/141128.html (rc1
May 18th)
* vscale (Kai)
* llvm-objdump with support for more instruction patterns
https://reviews.llvm.org/D78702 (patch from Simon)
* LTO/ThinLTO for RISC-V https://reviews.llvm.org/D78035
* We will reschedule the discussion on differential testing work to
next week instead
* No other topics were submitted, as always, please do submit things
you'd like to discuss