RFR: 8264417: ParallelCompactData::region_offset should not accept pointers outside the current region

[Thomas Schatzl]

On Tue, 30 Mar 2021 09:21:15 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Change the accepted value range for `ParallelCompactData::region_offset` to avoid the surprising result, 0.

Lgtm.

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Marked as reviewed by tschatzl (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/3260