RFR: 8378715: Use early field initialization for java.lang.invoke generated code

[Chen Liang]

On Wed, 25 Feb 2026 21:27:08 GMT, Chen Liang <liach at openjdk.org> wrote:

> With Flexible Constructor Bodies, the preferred way to assign fields for objects is to assign before making a super call. These are all sites in the JDK code that can migrate to the new preferred pattern. This change also allows these fields to be later declared ACC_STRICT_INIT when strict fields JEP is integrated.

Not only that, I think these are the only valid appearance sites of `CodeBuilder::invokespecial` that represent super calls instead of new instance creations and has associated field store instructions within the whole JDK.

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PR Comment: https://git.openjdk.org/jdk/pull/29926#issuecomment-3968733813