message: avoid dup allocation
diff: @@ -1273,11 +1273,12 @@ static void optimize_ptrcmp(Function &f) {
  auto cond = icmp->getCond();
  bool is_eq = cond == ICmp::EQ || cond == ICmp::NE;
  - Value *op0 = const_cast<Value *>(icmp->operands()[0]);
  - Value *op1 = const_cast<Value *>(icmp->operands()[1]);
  + auto ops = icmp->operands();
  + auto *op0 = ops[0];
  + auto *op1 = ops[1];
  if (is_eq &&
  - ((is_inbounds(*op0) && dynamic_cast<NullPointerValue*>(op1)) ||
  - (is_inbounds(*op1) && dynamic_cast<NullPointerValue*>(op0)))) {
  + ((is_inbounds(*op0) && dynamic_cast<const NullPointerValue*>(op1)) ||
  + (is_inbounds(*op1) && dynamic_cast<const NullPointerValue*>(op0)))) {
  // (gep inbounds p, ofs) == null
  const_cast<ICmp*>(icmp)->setPtrCmpMode(ICmp::PROVENANCE);
  }
  