RFR: 8354996: Reduce dynamic code generation for a single downcall

[Chen Liang]

On Thu, 17 Apr 2025 19:44:07 GMT, Chen Liang <liach at openjdk.org> wrote:

> Perf numbers for simple main:
> Linking of `Class::forName0` down from ~152 to ~83
> 
> For calling little color management system https://bugs.openjdk.org/browse/JDK-8313344:
> JNI: ~45
> baseline panama: ~164
> patch: ~103
> 
> Also see #24705.

Testing: tier 1-3

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PR Comment: https://git.openjdk.org/jdk/pull/24742#issuecomment-2814458553