[PATCH] sim: riscv: Fix build fail since INSN_CLASS_A was removed.

[Tom Tromey]

>>>>> "Nelson" == Nelson Chu <nelson@rivosinc.com> writes:

Nelson> Thanks, I think it would be good to apply the fix from Bernd,
Nelson> since I'm not the expert and regular contributor of gdb ;)

Either way is fine by me.  Thanks again.

Tom