Fix static lazy field holder for GraalVM

[szymon-rd]

The new lazy vals implementation was not working in graalvm's native image. The generated holder for the lazy value was static post-compilation. It caused the generated code to perform CAS operate on bad addresses and throw Bus Error.
Issue on oracle/graalvm: oracle/graal#5863
This PR removes the static modifier from the lazy val holder and makes it accessible via MODULE$ instead. It fixes the CAS on GraalVM and does not have a performance impact, at least judging by the benchmark I've added to this PR.

[szymon-rd]

@Kordyjan I removed getStaticFieldOffset that was experimental in pre-3.3.0-RCx. It was made stable in 3.3.0-RC1. As tasty is experimental, I understand that it's ok, right?

[sjrd]

@Kordyjan I removed getStaticFieldOffset that was experimental in pre-3.3.0-RCx. It was made stable in 3.3.0-RC1. As tasty is experimental, I understand that it's ok, right?

Yes, that's OK.