message: Fix MLFuncBuilder::createOperation.
  createOperation needs to insert the operation at 'insertPoint', which can be
  anywhere (not necessarily at the end of 'statements').
diff: @@ -218,9 +218,9 @@ public:
  OperationStmt *createOperation(Identifier name, ArrayRef<MLValue *> operands,
  ArrayRef<Type *> resultTypes,
  ArrayRef<NamedAttribute> attributes) {
  - auto op =
  + auto *op =
  OperationStmt::create(name, operands, resultTypes, attributes, context);
  - block->getStatements().push_back(op);
  + block->getStatements().insert(insertPoint, op);
  return op;
  }
  