[lworld] RFR: 8327214: [lworld] Valhalla compiler testing move to classfile API

[Chen Liang]

Testing: 3 updated tests, tier 1-3 in progress

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Commit messages:
 - Broken
 - Remove obsolete lib imports
 - 8327214: [lworld] Valhalla compiler testing move to classfile API

Changes: https://git.openjdk.org/valhalla/pull/1365/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1365&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8327214
  Stats: 6403 lines in 26 files changed: 0 ins; 6378 del; 25 mod
  Patch: https://git.openjdk.org/valhalla/pull/1365.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1365/head:pull/1365

PR: https://git.openjdk.org/valhalla/pull/1365