RFR: 8365885: Clean up constant pool reflection native code

[Chen Liang]

On Wed, 20 Aug 2025 21:29:29 GMT, Chen Liang <liach at openjdk.org> wrote:

> When I was trying to reuse this constant pool reflection for assembly phase indy argument validation, I noted the JNI code has a lot of confusing arguments. In particular, the JVM_ConstantPoolGetSize is wrong because of argument confusion. We should remove the unused arguments to reduce confusion.

Thanks for the reviews! This will help my use of ConstantPool reflection for leyden prototyping.

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PR Comment: https://git.openjdk.org/jdk/pull/26870#issuecomment-3225698937