RFR: 8308034: Some CDS tests need to use @requires vm.flagless

[Calvin Cheung]

Add `@requires vm.flagless` to three CDS tests because they don't work well with additional vm option such as `ObjectAlignmentInBytes`.

Testing:
- tier1
- all CDS tests with `-XX:ObjectAlignmentBytes=16`

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Commit messages:
 - 8308034: Some CDS tests need to use @requires vm.flagless

Changes: https://git.openjdk.org/jdk/pull/14062/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14062&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8308034
  Stats: 8 lines in 3 files changed: 5 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/14062.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14062/head:pull/14062

PR: https://git.openjdk.org/jdk/pull/14062