RISC-V LLVM sync-up call 4th February 2021

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 every alternate Thursday at 4pm GMT, via

We have a shared calendar which 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;

Topics to discuss today include the following:
* 12.0.0 backports
  * <49031 – Merge b4106f9c7b8c498d109301ced7bf9aca32027168 to 12.0.0; (awaiting merge)
  * <48969 – Merge 282aca10aeb03bdaef0a8d4f3faa4c2ff236e527 and 9847023660467a4469b5667bcf7a4c73a4780037 to 12.0.0; (merged)
  * Any others?
* Multiple P MC layer patches <https://reviews.llvm.org/D94579&gt;
* RVV topics
  * Spilling and frame handling <Login;
  * RVV whole register load/store for generic load/store
* Heads up:
  * fp16 ABI discussion <https://github.com/riscv/riscv-elf-psabi-doc/pull/172&gt;
  * libcxx on 32-bit architecutres with 64-bit `time_t`
* Any other business?
* Next call: 18th Feb 2021