[jdk11u-dev] RFR: 8210988: Improved handling of compiler warnings in the build [v2]

[Andrew Lu]

> I backport this for parity with 11.0.24-oracle.
> All clean except some added lines are different.

Andrew Lu 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 'openjdk:master' into andrewLu_backport_8210988
 - Backport 09a967ab8143c3d4b0824a0027edaf0e634686ec

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

Changes:
  - all: https://git.openjdk.org/jdk11u-dev/pull/2606/files
  - new: https://git.openjdk.org/jdk11u-dev/pull/2606/files/150567d8..383b9e3d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2606&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2606&range=00-01

  Stats: 1714 lines in 25 files changed: 1296 ins; 325 del; 93 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2606.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2606/head:pull/2606

PR: https://git.openjdk.org/jdk11u-dev/pull/2606