The 39036e7c20 introduced
`recompileOnMacroDef` option to IncOptions. However, not all necessary
logic has been changed. This commit fixes that:
* `copy` method does not forget the value of the `recompileOnMacroDef`
flag
* `productArity` has been increased to match the arity of the class
* `productElement` returns the value of `recompileOnMacroDef` flag
* `hashCode` and `equals` methods take into account value of
`recompileOnMacroDef` flag
* fix the name of the key for `recompileOnMacroDef` flag