fixes #8514, TypeApi#baseType exposed into Tasty

[pshirshov]

No description provided.

[dottybot]

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[smarter]

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[pshirshov]

@nicolasstucki : I kinda can't understand how do I run these tests in run-macros, so I didn't add a test.

[smarter]

Macro tests are bootstrapped only, so you can run them using dotty-bootstrapped/testCompilation tests/run-macros/foo (and they're also run by the CI in the test_bootstrapped job)

[pshirshov]

@smarter : thanks, that worked. Pushed a basic test. Seems like that should be enough to finish izumi-reflect.

[nicolasstucki]

Otherwise looks good

[pshirshov]

@nicolasstucki : fixed. Could you accept it now?