RISC-V LLVM sync-up call 26 Mar 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>

Issues to discuss today include the following:
* LLVM 10 out - thank you everyone for your contributions!
* Further compact code model feedback
* Update on embedded PIC discussions
* ELF attribute support
* Landing bitmanip
* Builtin thread pointer <https://bugs.llvm.org/show_bug.cgi?id=45303>
* Meeting time and daylight savings - will move to 4pm BST from next week
* No other topics were submitted, as always, please do submit things
you'd like to discuss