[lworld] RFR: 8288135: [lworld] Implement HotSpot flag -XX:+EnablePrimitiveClasses [v8]

[David Simms]

> Runtime component of -XX:+EnablePrimitiveClasses switch

David Simms has updated the pull request incrementally with two additional commits since the last revision:

 - supports_inline_types() refers to classfile and is separate from Enable flags
 - Further testing explicity using flags

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Changes:
  - all: https://git.openjdk.org/valhalla/pull/727/files
  - new: https://git.openjdk.org/valhalla/pull/727/files/5ee270c2..25d17901

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=valhalla&pr=727&range=07
 - incr: https://webrevs.openjdk.org/?repo=valhalla&pr=727&range=06-07

  Stats: 26 lines in 6 files changed: 14 ins; 2 del; 10 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