RFR: 8304144: G1: Remove unnecessary is_survivor check in G1ClearCardTableTask

[Thomas Schatzl]

On Tue, 14 Mar 2023 15:02:57 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Simple removing redundant check.
> 
> Test: tier1-6

Lgtm.

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Marked as reviewed by tschatzl (Reviewer).

PR: https://git.openjdk.org/jdk/pull/13023