[jdk11u-dev] RFR: 8210988: Improved handling of compiler warnings in the build [v3]

[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 incrementally with two additional commits since the last revision:

 - Merge remote-tracking branch 'origin/andrewLu_backport_8210988' into andrewLu_backport_8210988
 - update

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Changes:
  - all: https://git.openjdk.org/jdk11u-dev/pull/2606/files
  - new: https://git.openjdk.org/jdk11u-dev/pull/2606/files/383b9e3d..dbd50f1d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2606&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2606&range=01-02

  Stats: 2 lines in 2 files changed: 0 ins; 1 del; 1 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