This allows us to model the `ResolvedCursorInfo` types as a proper type hierarchy instead of having to store all values in the base `ResolvedCursorInfo` type.
rdar://102853071
Begin refactoring the request evaluator by swapping SWIFT_TYPEID for
SWIFT_REQUEST. Introduce the Zone of the request as a formal parameter
to the macro, then re-expand the request macro to get the type info
back.
SWIFT_REQUEST will eventually grow to encompass more information about
requests as we seek to reduce the boilerplate involved in their
definitions.
