RFR: 8286474: Drop --enable-preview from Sealed Classes related tests

Tue May 10 12:46:48 UTC 2022

On Tue, 10 May 2022 12:07:31 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> There are plenty of tests failing on many architectures due to `--enable-preview` VM code introduced by Loom. This improvement eliminates some of the redundant `--enable-preview` clauses from the Sealed Classes tests, since Sealed Classes have been graduated from preview in JDK 17.
> 
> Additional testing:
>  - [x] Linux x86_64 fastdebug, affected tests still pass
>  - [x] Linux x86_32 fastdebug, affected tests start to pass

The changes look fine to me. Both these files will need a copyright year update, I think.

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PR: https://git.openjdk.java.net/jdk/pull/8627