- Add a new bound node to represent the dispatch of a switch statement, and use it for a sequence of value tests in the pattern switch.
- Generate a string switch using a hash code (as before) for a pattern switch.
- Remove much of the old switch binder, except what is still used.
- Fix wrong `InputType` recorded for BoundRecursivePattern.
- Prevent cascaded subsumption errors from erroneous patterns.
- Make the bound node factory use BoundSwitchDispatch rather than BoundSwitchStatement.
- Remove obsolete bound nodes from previous switch implementation.