RISC-V LLVM sync-up call 9th Jan 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 hopefully 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 10.0 is scheduled to branch on Jan 15th. Are there any patches
no in this email we particularly want to land?
* [Like to land] Save/restore of callee registers
https://reviews.llvm.org/D62686 now has new parent
* [Like to land] Shrink wrapping https://reviews.llvm.org/D62190
* Encoding target-abi in LLVM bitcode for LLVM
related to <https://reviews.llvm.org/D71387>.
* CSR read/write intrinsics https://reviews.llvm.org/D71778
* Luis is about to investigate driver issues that crop up when running
clang on a RISC-V host. Do let us know if you're already looking at