Fix #1653: Check "no inherit from final" earlier. #1666
Merged
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The test case is an illegal inheritance from a primitive value class,
which makes this an illegal value class. Previously, the error was
detected by refchecks, but crashes occurred earlier (when generating
synthesized methods) or at the same phase block (in extension methods).
The problem is avoided by moving the test to Namer.
Review by @smarter.