[lworld] RFR: 8354728: [lworld] Langtools work to update strict implementation to latest [v3]

[Chen Liang]

> The updates to the core libraries + langtools for the latest strict field initialization spec https://cr.openjdk.org/~dlsmith/jep401/jep401-20250409/specs/strict-fields-jvms.html is ready.
> 
> Currently, since there is no VM support, testing is restricted to generation by ClassFile API/javac and inspection through ClassFile API (and javap)
> 
> Not suitable for integration yet; StrictFinalInstanceFieldsTest requires VM side's support.

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 six additional commits since the last revision:

 - Merge branch 'lworld' of https://github.com/openjdk/valhalla into feature/unset-update
 - Tweaks to let tests pass
 - Chen comment
 - 8354694: [lworld] Refactor AssertUnsetFields to Early Larval Frame
 - Review suggestions, also rollback the getEntryType rename in javac, test updates
 - 8354728: [lworld] Langtools work to update strict implementation to latest

-------------

Changes:
  - all: https://git.openjdk.org/valhalla/pull/1432/files
  - new: https://git.openjdk.org/valhalla/pull/1432/files/52d38be4..8ee7a891

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=valhalla&pr=1432&range=02
 - incr: https://webrevs.openjdk.org/?repo=valhalla&pr=1432&range=01-02

  Stats: 988 lines in 41 files changed: 409 ins; 377 del; 202 mod
  Patch: https://git.openjdk.org/valhalla/pull/1432.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1432/head:pull/1432

PR: https://git.openjdk.org/valhalla/pull/1432