RFR: JDK-8325189: Enable this-escape javac warning in java.base [v2]

[Joe Darcy]

> After the "this-escape" lint warning was added to javac (JDK-8015831), the base module was not updated to be able to compile with this warning enabled. This PR makes the necessary changes to allow the base module to build with the warning enabled.

Joe Darcy 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 two additional commits since the last revision:

 - Merge branch 'master' into JDK-8325189
 - JDK-8325189: Enable this-escape javac warning in java.base

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/17692/files
  - new: https://git.openjdk.org/jdk/pull/17692/files/8a160a7c..e1d56388

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17692&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17692&range=00-01

  Stats: 5575 lines in 160 files changed: 3404 ins; 1290 del; 881 mod
  Patch: https://git.openjdk.org/jdk/pull/17692.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17692/head:pull/17692

PR: https://git.openjdk.org/jdk/pull/17692