[crac] RFR: Provide arguments for restore [v7]

[Anton Kozlov]

On Thu, 7 Apr 2022 13:35:56 GMT, Anton Kozlov <akozlov at openjdk.org> wrote:

>> This change adds an ability to receive a new set of command-line arguments in the restored Java instance. The supplied demo code shows a faster replacement for `javac`.
>
> Anton Kozlov has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Handle missing env (although should not happen)

I propose to move with the PR in its current form, unless it is wrong. If not, we can fix it later based on user's feedback. I deliberately don't add the documentation to preserve some flexibility.

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PR: https://git.openjdk.java.net/crac/pull/16