RFR: 8318144: Match on enum constants with body compiles but fails with MatchException

[Jan Lahoda]

For code like:

enum E {A {}, B {} }
Object o = E.A;
switch (o) {
     case E.A -> System.err.println(o);
     default -> System.err.println("default");
}


The result is `default`, not `A`, due to incorrect classes being compared. Thanks for @liach for noting the solution here:
https://github.com/openjdk/jdk/pull/16489#discussion_r1381411165

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Commit messages:
 - 8318144: Match on enum constants with body compiles but fails with MatchException

Changes: https://git.openjdk.org/jdk/pull/16499/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16499&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8318144
  Stats: 109 lines in 3 files changed: 107 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/16499.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16499/head:pull/16499

PR: https://git.openjdk.org/jdk/pull/16499