RFR: 8264472: Add a test group for running CDS tests with -XX:+VerifySharedSpaces

[Calvin Cheung]

On Wed, 28 Apr 2021 17:54:34 GMT, Ioi Lam <iklam at openjdk.org> wrote:

>> Add a new test group `hotspot_cds_verify_shared_spaces` for running some CDS tests with the `-XX:+VerifySharedSpaces` option.
>> 
>> Testing: hs-tier4.
>
> LGTM

@iklam, @mseledts, Thanks for the quick review.

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PR: https://git.openjdk.java.net/jdk/pull/3771