RISC-V Disassembler/translator instruction decoding disagreement

This bug has been copied automatically from: https://bugs.launchpad.net/qemu/+bug/1826568

When running QEMU V3.1.0 for platform  RISC-V, 64bit, Spike V1.10 with "-d
in_asm -singlestep -D qemu_log.txt", my (faulty) test code brought up this
message in the logs:

  0x000000008002cade:  051300009517e2bf  illegal
  Disassembler disagrees with translator over instruction decoding
  Please report this to qemu-devel@nongnu.org


You may want to resolve the disagreement.

Axel