8335922: Incorrect @Stable usage of LambdaForm$Name.index

[rm-gh-8]

Backporting JDK-8335922: Incorrect @stable usage of LambdaForm$Name.index.

Updated all code that uses the index field to work with the new final modifier.

Ran GHA Sanity Checks (passed) and related tests (passed).

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• JDK-8335922 needs maintainer approval

Issue

• JDK-8335922: Incorrect @Stable usage of LambdaForm$Name.index (Bug - P4 - Requested)

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This backport pull request has now been updated with issue from the original commit.

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[rm-gh-8]

/approval request for backport of JDK-8335922: Incorrect @stable usage of LambdaForm$Name.index.

This commit converts index field to final and updates all usages accordingly. The @stable annotation on the index field is incorrect since it only prevents inlining zero values.

Ran the related tests:

(Passed) - make test TEST=test/jdk/java/lang/invoke

Results are attached.
macos-aarch64-specific-test.log

[openjdk]

@rm-gh-8
8335922: The approval request has been created successfully.