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

[Calvin Cheung]

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

Testing: hs-tier4.

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

Changes: https://git.openjdk.java.net/jdk/pull/3771/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3771&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8264472
  Stats: 17 lines in 1 file changed: 17 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3771.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3771/head:pull/3771

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