RFR: 8325503: Add GC specific prefix for CheckForUnmarked related classes

[Kim Barrett]

On Thu, 8 Feb 2024 16:05:57 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Add prefix some generic class names used for young-gc card verification.

Yikes!  ODR violations are nasty!  Looks good.

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Marked as reviewed by kbarrett (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/17774#pullrequestreview-1870878739