[lworld] RFR: 8288135: [lworld] Implement HotSpot flag -XX:+EnablePrimitiveClasses [v12]

[David Simms]

> Runtime component of -XX:+EnablePrimitiveClasses switch

David Simms has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 24 commits:

 - Merge branch 'lworld' into 8288135
 - Review comments applied
 - Merge branch 'lworld' into 8288135
 - Extra assertion info for tracking spurious issue
 - supports_inline_types() refers to classfile and is separate from Enable flags
 - Further testing explicity using flags
 - Disable EnablePrimitiveClasses by default
 - Explictly flag more tests
 - Merge branch 'lworld' into 8288135
 - jdk_valhalla tests
 - ... and 14 more: https://git.openjdk.org/valhalla/compare/ee15e2d9...92e5253d

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Changes: https://git.openjdk.org/valhalla/pull/727/files
 Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=727&range=11
  Stats: 1365 lines in 245 files changed: 836 ins; 65 del; 464 mod
  Patch: https://git.openjdk.org/valhalla/pull/727.diff
  Fetch: git fetch https://git.openjdk.org/valhalla pull/727/head:pull/727

PR: https://git.openjdk.org/valhalla/pull/727