[jdk16] RFR: 8258972: unexpected compilation error with generic sealed interface

[Vicente Romero]

Hi,

Please review this fix to the implementation of section `5.1.6.1 Allowed Narrowing Reference Conversion` of the Sealed Classes spec [1](http://cr.openjdk.java.net/~gbierman/jep397/jep397-20201204/specs/sealed-classes-jls.html#jls-5.1.6.1). IMO the compiler was not implementing the spec to the letter in particular the inheritance relation between a sealed class and a subclass should be tested ignoring type arguments which is what this patch is doing. Comments?

Thanks,
Vicente

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Commit messages:
 - 8258972: unexpected compilation error with generic sealed interface

Changes: https://git.openjdk.java.net/jdk16/pull/72/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk16&pr=72&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8258972
  Stats: 12 lines in 2 files changed: 11 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk16/pull/72.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk16 pull/72/head:pull/72

PR: https://git.openjdk.java.net/jdk16/pull/72