Integrated: 7509: Add 2021-09 target platform

[Marcus Hirt]

On Fri, 14 Jan 2022 13:20:12 GMT, Marcus Hirt <hirt at openjdk.org> wrote:

> ...also updating babel.

This pull request has now been integrated.

Changeset: f8105b87
Author:    Marcus Hirt <hirt at openjdk.org>
URL:       https://git.openjdk.java.net/jmc/commit/f8105b87ccc8b77842e100ed35b4d9556e34a6b0
Stats:     115 lines in 6 files changed: 107 ins; 0 del; 8 mod

7509: Add 2021-09 target platform

Reviewed-by: aptmac

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PR: https://git.openjdk.java.net/jmc/pull/357