message: Change assert message to mention `nullptr` instead of `sentinel`: this is likely more helpful to the user when it fires
diff: @@ -182,7 +182,7 @@ Instruction::create(Location location, OperationName name,
  unsigned operandIt = 0, operandE = operands.size();
  unsigned nextOperand = 0;
  for (; operandIt != operandE; ++operandIt) {
  - // Null operands are used as sentinals between successor operand lists. If
  + // Null operands are used as sentinels between successor operand lists. If
  // we encounter one here, break and handle the successor operands lists
  // separately below.
  if (!operands[operandIt])
  @@ -192,21 +192,21 @@ Instruction::create(Location location, OperationName name,
  unsigned currentSuccNum = 0;
  if (operandIt == operandE) {
  - // Verify that the amount of sentinal operands is equivalent to the number
  + // Verify that the amount of sentinel operands is equivalent to the number
  // of successors.
  assert(currentSuccNum == numSuccessors);
  return inst;
  }
  assert(!inst->isKnownNonTerminator() &&
  - "Sentinal operand found in non terminator operand list.");
  + "Unexpected nullptr in operand list when creating non-terminator.");
  auto instBlockOperands = inst->getBlockOperands();
  unsigned *succOperandCountIt = inst->getTrailingObjects<unsigned>();
  unsigned *succOperandCountE = succOperandCountIt + numSuccessors;
  (void)succOperandCountE;
  for (; operandIt != operandE; ++operandIt) {
  - // If we encounter a sentinal branch to the next operand update the count
  + // If we encounter a sentinel branch to the next operand update the count
  // variable.
  if (!operands[operandIt]) {
  assert(currentSuccNum < numSuccessors);
  @@ -216,7 +216,7 @@ Instruction::create(Location location, OperationName name,
  if (currentSuccNum != 0) {
  ++succOperandCountIt;
  assert(succOperandCountIt != succOperandCountE &&
  - "More sentinal operands than successors.");
  + "More sentinel operands than successors.");
  }
  new (&instBlockOperands[currentSuccNum])
  @@ -229,7 +229,7 @@ Instruction::create(Location location, OperationName name,
  ++(*succOperandCountIt);
  }
  - // Verify that the amount of sentinal operands is equivalent to the number of
  + // Verify that the amount of sentinel operands is equivalent to the number of
  // successors.
  assert(currentSuccNum == numSuccessors);
  