[lworld] RFR: 8351362: Post-process @Strict annotation for testing

[Chen Liang]

Added a test tool to strictify files and migrated the existing StrictFinalInstanceFieldsTest as an example.

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Commit messages:
 - 8351362: Post-process @Strict annotation for testing

Changes: https://git.openjdk.org/valhalla/pull/1395/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1395&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8351362
  Stats: 228 lines in 5 files changed: 224 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/valhalla/pull/1395.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1395/head:pull/1395

PR: https://git.openjdk.org/valhalla/pull/1395