The select op has 3 inputs: input1, input2, input3 to according to the
tosa specification. However, use of getInput1(), getInput2() and
getInput3() in the codebase can be confusing and hinder readability.
This commit adds custom getters to help improve readability:
- input1 -> getPred()
- input2 -> getOnTrue()
- input3 -> getOnFalse()
They should be preferred as they are more descriptive, however, the ODS
generated getters (getInputX()) may still be used.
Unfortunately the custom getters don't propagate to Adaptors such as
`FoldAdaptor`, so the ODS generated getters must be used.
2e7aa7ead6