[Bug target/122869] risc-v loops miscompiled: loop with fault-only-first intrinsics never terminates when `-O0`

[rdapp at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122869

--- Comment #4 from Robin Dapp <rdapp at gcc dot gnu.org> ---
My hunch is that an extra

  (set (match_operand:SI 8 "register_operand" "=r, r, r, r")
      (reg:SI VL_REGNUM))]

or similar would work, where operand[8] would be &d.  That way the assignment
should be atomic enough?

When doing that we couldn't reuse use_contiguous_load_insn but would need a
preparation function but that shouldn't be a big deal. 

Jeff, if you want me to take it, feel free to assign it as I have some state
now.