Implement static field base and offset substitutions for Unsafe

[ivan-ristovic]

This PR implements staticFieldOffset and staticFieldBase methods in com.oracle.svm.core.jdk.SunMiscUnsafeSubstitutions

[graalvmbot]

Hello ivan-ristovic, thanks for contributing a PR to our project!

We use the Oracle Contributor Agreement to make the copyright of contributions clear. We don't have a record of you having signed this yet, based on your email address ivan -(dot)- ristovic95 -(at)- gmail -(dot)- com. You can sign it at that link.

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[peter-hofer]

Thank you @ivan-ristovic !

[peter-hofer]

@ivan-ristovic , have you already signed and submitted the Oracle Contributor Agreement (OCA)? If not, please follow the instructions in step II here: https://www.graalvm.org/community/contributors/

[ivan-ristovic]

Yes I have, and I have received a response long time ago. I assumed that the bot will automatically pick that up.

[peter-hofer]

Looks like @cstancu has already merged a PR with static fields support in Unsafe: 7df6884. Sorry about the timing, but thank you for your contribution!

Regarding the OCA, I have manually added you to our database so the bot should be satisfied alone in the future.

[cstancu]

@ivan-ristovic sorry for this, searching through the issues mentioning static field unsafe support I only found #2694 and #3020, not this PR unfortunately.

[ivan-ristovic]

@cstancu No worries!
@peter-hofer Roger, thanks!