RFR: 8294972: Convert jdk.jlink internal plugins to use the Classfile API [v6]

[Mandy Chung]

On Wed, 15 Mar 2023 16:37:54 GMT, Adam Sotona <asotona at openjdk.org> wrote:

>> src/jdk.jlink/share/classes/jdk/tools/jlink/internal/plugins/SystemModulesPlugin.java line 614:
>> 
>>> 612:         private void genConstructor(ClassBuilder clb) {
>>> 613:             clb.withMethod("<init>", MethodTypeDesc.of(CD_void),
>>> 614:                     ACC_PUBLIC, mb -> mb.withFlags(ACC_PUBLIC).withCode( cob -> {
>> 
>> Why `withFlags(ACC_PUBLIC)` when the flags is already given in `withMethod`'s 3rd argument? Same for occurrences below.
>
> It has been redundant, now more effective `withMethodBody` method is used.

I also had the same comment in PR [12945](https://github.com/openjdk/jdk/pull/12945).   Similar change should apply to PR 12945.

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PR: https://git.openjdk.org/jdk/pull/12944