RFR: 8305104: Remove old core reflection implementation

[Mandy Chung]

JEP 416 integrated in JDK 18 and since then, only a couple minor issues has been reported.  Those issues were related with exception being thrown with invalid arguments.   We propose to remove the old core reflection implementation in JDK 22.  The `-Djdk.reflect.useDirectMethodHandle=false` workaround to revert to the old implementation will stop to work.

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Commit messages:
 - clean up
 - Merge branch 'master' of https://github.com/openjdk/jdk into remove-old-reflection
 - Merge branch 'master' of https://github.com/openjdk/jdk into remove-old-reflection
 - Merge branch 'master' of https://github.com/openjdk/jdk into remove-old-reflection
 - merge
 - Merge branch 'master' of https://github.com/openjdk/jdk into remove-old-reflection
 - 8305104: Remove the old core reflection implementation

Changes: https://git.openjdk.org/jdk/pull/14371/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14371&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8305104
  Stats: 6319 lines in 78 files changed: 13 ins; 6238 del; 68 mod
  Patch: https://git.openjdk.org/jdk/pull/14371.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14371/head:pull/14371

PR: https://git.openjdk.org/jdk/pull/14371