[jdk17] RFR: 8268594: runtime/handshake tests don't need WhiteBox after AOT removal

[Igor Ignatyev]

Hi all,

could you please review this small test-only patch?
from JBS:
> `runtime/handshake/HandshakeTransitionTest.java` and `HandshakeTimeoutTest.java` use WhiteBox to check the value of `UseJVMCICompiler` as a workaround for AOT not supporting local handshakes (see [JDK-8191437](https://bugs.openjdk.java.net/browse/JDK-8191437)). 
>
> this isn't needed anymore and can be removed.

testing: `runtime/handshake` tests on `{linux,windows,macosx}-x64`

Thanks,
-- Igor

-------------

Commit messages:
 - 8268594

Changes: https://git.openjdk.java.net/jdk17/pull/19/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17&pr=19&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8268594
  Stats: 26 lines in 2 files changed: 0 ins; 24 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk17/pull/19.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17 pull/19/head:pull/19

PR: https://git.openjdk.java.net/jdk17/pull/19