[lworld] RFR: 8276187: [lworld] [lw3] Handling of pre-loaded fields is inefficient

[Frederic Parain]

Please review those changes reducing the number of time pre-loaded fields are fetched from the system dictionary.
The changes would also help supporting field circularity in the future if needed.
Tested with Mach5, tier 1 to 3.

Thank you,

Fred

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Commit messages:
 - Rework preloading of inline fields

Changes: https://git.openjdk.java.net/valhalla/pull/576/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla&pr=576&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8276187
  Stats: 48 lines in 4 files changed: 13 ins; 21 del; 14 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/576.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/576/head:pull/576

PR: https://git.openjdk.java.net/valhalla/pull/576