[crac] RFR: Minor code cleanup and improvements

[Anton Kozlov]

On Wed, 10 May 2023 12:20:07 GMT, Radim Vansa <duke at openjdk.org> wrote:

> Extracted non-essential changes from other PR.

src/java.base/share/classes/javax/crac/CheckpointException.java line 50:

> 48:      * @param message the detail message.
> 49:      */
> 50:     public CheckpointException(String message) {

What if we remove this constructor and hide the other one? https://github.com/openjdk/crac/pull/60/files#r1190070472

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PR Review Comment: https://git.openjdk.org/crac/pull/64#discussion_r1190072341