message: remove operand count checker
diff: @@ -88,9 +88,7 @@ bool IsPeerOperation(const HloInstruction* inst,
  return false;
  }
  - // Check opcode and operand count.
  - if (peer_candidate->opcode() != inst->opcode() ||
  - peer_candidate->operand_count() != inst->operand_count())
  + if (peer_candidate->opcode() != inst->opcode())
  return false;
  const HloInstruction* operand_slice0 = peer_candidate->operand(0);
  