[lworld] RFR: 8378273: [lworld] Use acmp map to detect oops for VarHandle [v5]

[Chen Liang]

> VarHandle reflectively checks if a class has oops (and does it incorrectly by not filtering static fields). This information is easily accessible from acmp maps, and we should use that instead of spinning our custom logic.

Chen Liang has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains five additional commits since the last revision:

 - Merge branch 'lworld' of https://github.com/openjdk/valhalla into fix/array-vh-acmp
 - Update terminology because everyone seems confused as hell
 - Refactors per comment
 - interface-typed fields were using atomic flat VHs ???
 - 8378273: [lworld] Use acmp map to detect oops for VarHandle

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Changes:
  - all: https://git.openjdk.org/valhalla/pull/2143/files
  - new: https://git.openjdk.org/valhalla/pull/2143/files/e36eff38..46b9d4c4

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=valhalla&pr=2143&range=04
 - incr: https://webrevs.openjdk.org/?repo=valhalla&pr=2143&range=03-04

  Stats: 322 lines in 51 files changed: 125 ins; 111 del; 86 mod
  Patch: https://git.openjdk.org/valhalla/pull/2143.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/2143/head:pull/2143

PR: https://git.openjdk.org/valhalla/pull/2143