RFR: 8291508: Fix some tests with "requires vm.jvmti & vm.continuations"

[Ao Qi]

On Mon, 1 Aug 2022 15:54:47 GMT, Alan Bateman <alanb at openjdk.org> wrote:

> > Since these two kinds (`jvmti` and `XMLDecoder` tests) of the fix are a little different, should I split this issue into two?
> 
> I think it would be better to split them.

XMLDecoder tests are filed: https://bugs.openjdk.org/browse/JDK-8291640. This issue was also updated.

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PR: https://git.openjdk.org/jdk/pull/9677