[lworld] RFR: 8294462: [lworld] set system property valhalla.enableValhalla when X:+EnableValhalla

[Roger Riggs]

Updated to set the system property after all of the option setting locations have been processed.
Verified via -XshowSettings.

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Commit messages:
 - 8294462: [lworld] set system property valhalla.enableValhalla when -XX:+EnableValhalla

Changes: https://git.openjdk.org/valhalla/pull/769/files
 Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=769&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8294462
  Stats: 37 lines in 1 file changed: 19 ins; 18 del; 0 mod
  Patch: https://git.openjdk.org/valhalla/pull/769.diff
  Fetch: git fetch https://git.openjdk.org/valhalla pull/769/head:pull/769

PR: https://git.openjdk.org/valhalla/pull/769