RFR: 8320750: Allow a testcase to run with multiple -Xlog [v2]

[Leo Korinth]

On Thu, 8 Feb 2024 09:00:22 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

>> Leo Korinth has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Added test, reworked code structure after suggestions from Stefan and Johan
>
> test/jtreg-ext/requires/VMProps.java line 752:
> 
>> 750:      */
>> 751:     private static boolean isXFlag(String flag) {
>> 752:         return flag.startsWith("-X") && !flag.startsWith("-XX:") && !flag.equals("-X");
> 
> `-XX:` is not wrong, but I wonder if this could/should be `-XX` instead.

Arguably `-XXSomeFlag` is a an x flag and not an xx flag, but I will change it.

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PR Review Comment: https://git.openjdk.org/jdk/pull/16824#discussion_r1482716346