RFR: 8310541: G1: Remove redundant check in G1Policy::need_to_start_conc_mark

[Kim Barrett]

On Wed, 21 Jun 2023 13:24:58 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Simple removing a redundant check, which has already been covered in the early-return part.

Looks good.

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Marked as reviewed by kbarrett (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/14588#pullrequestreview-1496133393