RFR: 8272196: Remove unused class ParStrongRootsScope

[Albert Mingkun Yang]

On Tue, 10 Aug 2021 08:42:57 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Trivial change of removing an unused class definition.

Thanks for the review.

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PR: https://git.openjdk.java.net/jdk/pull/5064