8373374: [lworld] Remove Unsafe.get/putValue

[liach]

Remove the old Unsafe getValue and putValue, which had some performance difficulties because they are megamorphic depending on the exact layout.

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Issue

• JDK-8373374: [lworld] Remove Unsafe.get/putValue (Enhancement - P4)

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[bridgekeeper]

👋 Welcome back liach! A progress list of the required criteria for merging this PR into lworld will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

❗ This change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[jatin-bhateja]

Removed my comments unrelated to this PR and moved them to following merge PR which has been updated with latest code from lworld
#1688

I plan to conclude this merge by next week, there are some failures, if the code changes are too many then I will open seperate follow up PRs for them instead of adding them with merge.

We don't use Unsafe.putValue/getValue in VectorAPI fallback so removing them looks fine to me.

Best Regards

[mlbridge]

Webrevs

• 01: Full - Incremental (860e902f)
• 00: Full (708675bc)