RFR: 8305104: Remove the old core reflection implementation [v2]

[Alan Bateman]

On Wed, 7 Jun 2023 22:02:57 GMT, Mandy Chung <mchung at openjdk.org> wrote:

>> 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.
>
> Mandy Chung has updated the pull request incrementally with one additional commit since the last revision:
> 
>   fix merge issue

The  old + new implementations have been in four releases, which is good for shaking out any regressions/issues. Removing the old implementation in JDK 22 is good.

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Marked as reviewed by alanb (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/14371#pullrequestreview-1469340126