8347530: Improve error message with invalid permits clauses

[biboudis]

Currently we report one kind of error message (subclass {0} must extend sealed class) when there is a compile-type error in cases like the following:

sealed class C0 permits S0 {}
class S0 {}  

This PR proposes to improve error reporting since there are other kinds of declarations that can also participate in sealed hierarchies like records, enums and interfaces.

---

Progress

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Issue

• JDK-8347530: Improve error message with invalid permits clauses (Bug - P4)

Reviewers

• Jan Lahoda (@lahodaj - Reviewer)

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[openjdk]

@biboudis This change now passes all automated pre-integration checks.

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8347530: Improve error message with invalid permits clauses

Reviewed-by: jlahoda

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At the time when this comment was updated there had been 19 new commits pushed to the master branch:

• 079fccf: 8353888: Implement JEP 510: Key Derivation Function API
• 0d86757: 8355488: Add stress mode for C2 loop peeling
• a0a3060: 8353638: C2: deoptimization and re-execution cycle with StringBuilder
• ... and 16 more: https://git.openjdk.org/jdk/compare/5cb231714f364064bb5a59db8eb07d43823478eb...master

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[mlbridge]

Webrevs

• 01: Full - Incremental (4fb2f9af)
• 00: Full (3195b3ad)

[lahodaj]

I wonder, would: KindName.kindName(subType.tsym) work?

[biboudis]

Indeed and I updated the PR. Thanks @lahodaj

[lahodaj]

Looks good to me!