RISC-V LLVM sync-up call 27th May 2021

For background on these calls, see
<http://lists.llvm.org/pipermail/llvm-dev/2019-September/135087.html&gt;\.

Reminder: the purpose is to coordinate 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 BST, via
<https://meet.google.com/ske-zcog-spp&gt;\. If you have topics to discuss,
please email me ahead and I can add them to the agenda.

We have a shared calendar that 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;

Agenda:
* Explicitly emitting relaxation .option directives
<Login;
* Confirming the choice of Zmmul over -mno-div
<Login;
* RFC: Relaxing ISA string ordering requirements
<https://github.com/riscv/riscv-toolchain-conventions/issues/11&gt;
* Final call for ELF attributes psABI changes
<https://github.com/riscv/riscv-elf-psabi-doc/pull/71&gt;
* PoC: Implementation of riscv_vector.h using a pragma
<Login;
* Lowering split float arguments <Login;
* Builtin function naming <https://github.com/riscv/riscv-c-api-doc/issues/19&gt;
* msave-restore with tailcall patches
<Login; <Login;
<https://github.com/riscv/riscv-toolchain-conventions/pull/10&gt;
* AOB

Cheers,
Luís