[foreign-memaccess+abi] Integrated: Clean up StringSupport

[Per Minborg]

On Mon, 14 Aug 2023 11:13:09 GMT, Per Minborg <pminborg at openjdk.org> wrote:

> This PR suggests some minor cleanups of the class `StringSupport`.

This pull request has now been integrated.

Changeset: e8edeb98
Author:    Per Minborg <pminborg at openjdk.org>
URL:       https://git.openjdk.org/panama-foreign/commit/e8edeb98a42df2901237be4e37f3b72cfe6c65ff
Stats:     5 lines in 1 file changed: 2 ins; 2 del; 1 mod

Clean up StringSupport

Reviewed-by: jvernee

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PR: https://git.openjdk.org/panama-foreign/pull/863