simplify trees that appear in tastycheck test #21274
Merged
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unfortunately it seems changing the classpath means representation of TASTy is not stable (but is semantically equivalent) i.e. some SHAREDtype might be replaced by equivalent types. This breaks the tastycheck test in #21214 with scala 2 library tasty.
By changing to ordinary classes instead of enum cases, we limit generated code and avoid these specific examples of instability in the test.
Manually, I confirmed that reverting the change to namer in #21214 still breaks the new test
[test_scala2_library_tasty]