Integrated: Use relevant variables in log messages, remove unused import

[William Kemper]

On Wed, 8 Mar 2023 22:03:01 GMT, William Kemper <wkemper at openjdk.org> wrote:

> Addresses feedback in PR#220.

This pull request has now been integrated.

Changeset: 87bf68f3
Author:    William Kemper <wkemper at openjdk.org>
URL:       https://git.openjdk.org/shenandoah/commit/87bf68f35c05c063c8a5865b22e1b9704f99e7e5
Stats:     35 lines in 1 file changed: 10 ins; 23 del; 2 mod

Use relevant variables in log messages, remove unused import

Reviewed-by: ysr, kdnilsen

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PR: https://git.openjdk.org/shenandoah/pull/222