* add type conversions for width != 1.

This still requires changes in the tblgenerated derivative files. For example, createForwardModeTangent in MulFOpFwdDerivative could be altered like this:
```
  LogicalResult createForwardModeTangent(Operation *op0, OpBuilder &builder, MGradientUtils *gutils) const
  {
    auto op = cast<arith::MulFOp>(op0);
    if (gutils->width != 1) {
      auto newop = gutils->getNewFromOriginal(op0);
      for (auto res : newop->getResults()) {
        res.setType(mlir::RankedTensorType::get({gutils->width}, res.getType()));
      }
    }
    gutils->eraseIfUnused(op);
    if (gutils->isConstantInstruction(op))
      return success();
    mlir::Value res = nullptr;
    if (!gutils->isConstantValue(op->getOperand(0)))
    {
      auto dif = gutils->invertPointerM(op->getOperand(0), builder);
      {
        mlir::Value itmp = ({
          // Computing MulFOp
          auto fwdarg_0 = dif;
          dif.dump();
          // TODO: gutils->makeBatched(...)
          auto fwdarg_1 = gutils->getNewFromOriginal(op->getOperand(1));
          builder.create<arith::MulFOp>(op.getLoc(), fwdarg_0, fwdarg_1);
        });
        itmp.dump();
        if (!res)
          res = itmp;
        else
        {
          auto operandType = cast<AutoDiffTypeInterface>(res.getType());
          res = operandType.createAddOp(builder, op.getLoc(), res, itmp);
        }
      }
    }
    if (!gutils->isConstantValue(op->getOperand(1)))
    {
      auto dif = gutils->invertPointerM(op->getOperand(1), builder);
      {
        mlir::Value itmp = ({
          // Computing MulFOp
          auto fwdarg_0 = dif;
          dif.dump();
          auto fwdarg_1 = gutils->getNewFromOriginal(op->getOperand(0));
          builder.create<arith::MulFOp>(op.getLoc(), fwdarg_0, fwdarg_1);
        });
        if (!res)
          res = itmp;
        else
        {
          auto operandType = cast<AutoDiffTypeInterface>(res.getType());
          res = operandType.createAddOp(builder, op.getLoc(), res, itmp);
        }
      }
    }
    assert(res);
    gutils->setDiffe(op->getResult(0), res, builder);
    return success();
  }
```

* add code to tblgen generator, this eventually needs to be a single function call.

* a test and formatting

* use tensor splatop

* remove stale enzyme-tblgen changes

* do the simple batching in enzyme-tblgen

* include tensor in all AutoDiffOpInterfaceImpls

* add enzyme broadcastop

* getShadowType for TensorTypeInterface

* create broadcastop in enzyme-tblgen

* Revert "include tensor in all AutoDiffOpInterfaceImpls"

This reverts commit c06ed01.

* test

* DenseI64ArrayAttr for shape instead of scalar width

* `llvm::SmallVector` --> `ArrayRef`

* formatting

* use getShadowType in BroadcastOp builder

Co-authored-by: Billy Moses <[email protected]>

* unstructured control flow test

* scf.for

* formatting

* support `scf.if` test

* formatting

* forgotten includes

---------

Co-authored-by: Jules Merckx <[email protected]>
Co-authored-by: Billy Moses <[email protected]>

* Fix copyslice v2

* fix