Try re-numbering field type constants to use jump tables in type case switches

This was originally discussed in #756.

With [SDK cl/256180][1], the compiler started to generate a binary search or jump tables for `switch` statements. Before the CL `switch` was compiled to linear scan of alternatives.

With the current implementation of field types, range of the integers being checked are quite large, so the compiler cannot generate a jump table and generates binary search.

We should try re-numbering the type constants to consecutive integers so that the compiler will be able to generate jump tables instead, and then benchmark it.

[1]: https://dart-review.googlesource.com/c/sdk/+/256180