[jdk11u-dev] RFR: 8210988: Improved handling of compiler warnings in the build [v4]

[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 one additional commit since the last revision:

  update

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

Changes:
  - all: https://git.openjdk.org/jdk11u-dev/pull/2606/files
  - new: https://git.openjdk.org/jdk11u-dev/pull/2606/files/dbd50f1d..ef761806

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2606&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2606&range=02-03

  Stats: 2 lines in 1 file changed: 1 ins; 0 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