RFR: 8283238: make/scripts/compare.sh should show the diff when classlist does not match

[Calvin Cheung]

On Wed, 16 Nov 2022 18:32:47 GMT, Calvin Cheung <ccheung at openjdk.org> wrote:

> Please review this change for enabling verbose (-vv) when running the compare.sh script so that the diff between files will be available in the build stdout file. This is for troubleshooting the two bugs ([JDK-8283220](https://bugs.openjdk.org/browse/JDK-8283220), [JDK-8295951](https://bugs.openjdk.org/browse/JDK-8295951)) which happened intermittently.

Thanks Erik and Magnus.

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PR: https://git.openjdk.org/jdk/pull/11192