Fix the AffineIfOp's default builder such that it takes in an
IntegerSetAttr. AffineIfOp has skipDefaultBuilders=1 which effectively
skips the creation of the default AffineIfOp::builder on the C++ side.
(AffineIfOp has two custom OpBuilder defined in the
extraClassDeclaration.) However, on the python side, _affine_ops_gen.py
shows that the default builder is being created, but it does not accept
IntegerSet and thus is useless. This fix at line 411 makes the default
python AffineIfOp builder take in an IntegerSet input and does not
impact the C++ side of things.
d50fbe43c9