[foreign-memaccess+abi] Withdrawn: Change local variable from Optional to String

[Per Minborg]

On Tue, 10 Oct 2023 12:43:14 GMT, Per Minborg <pminborg at openjdk.org> wrote:

> This PR suggests removing the storage of `Optional` instance variables and instead adhere to the recommendations of Optional usage. This will also reduce memory usage slightly.

This pull request has been closed without being integrated.

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PR: https://git.openjdk.org/panama-foreign/pull/907