RFR: 8333749: Consolidate ConstantDesc conversion in java.base [v6]

[Claes Redestad]

On Fri, 7 Jun 2024 13:56:24 GMT, Chen Liang <liach at openjdk.org> wrote:

>> In java.base, especially in bytecode generators, we have many different methods converting known valid Class and MethodType into ClassDesc and MethodTypeDesc. These conversions should be consolidated into the same utility method for the ease of future maintenance.
>
> Chen Liang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   ExE-Boss review, go through validated path in Class

Good incremental improvements.

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Marked as reviewed by redestad (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/19585#pullrequestreview-2104694382