[Bug target/122299] New: riscv: Bit rot in dynamic LMUL selection.

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122299

            Bug ID: 122299
           Summary: riscv: Bit rot in dynamic LMUL selection.
           Product: gcc
           Version: 16.0
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rdapp at gcc dot gnu.org
  Target Milestone: ---
            Target: riscv

The dynamic LMUL code hasn't been kept in good shape and is just limping along.
 Consequently at least five different tests are FAILing right now.

This is a bookkeeping PR in case we want to work on the code post stage1.