[crac] RFR: Support passing extra options in CREngine [v4]

[Radim Vansa]

On Thu, 15 Jun 2023 12:19:06 GMT, Radim Vansa <rvansa at openjdk.org> wrote:

>> In addition to `-XX:CREngine=program` this adds support to `-XX:CREngine=program,--key,value,--anotherkey` that translates into invoking `program --key value --anotherkey`. Commas support escaping with a backslash.
>> 
>> This generic parameters support is utilized in `criuengine` that accepts `--verbosity` and `--log-file` options and relays them to `criu`.
>
> Radim Vansa has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Use index var rather than looking up NULLs

Updated using the index var.

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PR Comment: https://git.openjdk.org/crac/pull/63#issuecomment-1592969385