RFR: 8275886: G1: remove obsolete comment in HeapRegion::setup_heap_region_size

[Albert Mingkun Yang]

On Mon, 25 Oct 2021 18:29:27 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Trivial change of removing obsolete comment.

Thanks for the review.

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PR: https://git.openjdk.java.net/jdk/pull/6113