This change fixes a bug preventing javac from emitting 'compiler.warn.sun.proprietary' diagnostics if `--system` is set to a non-default value. The diagnostics are currently emitted for values of `--release`, and for the default value of `--system`.
The is a redo of [JDK-8331081](https://bugs.openjdk.org/browse/JDK-8331081), which was backed out in [JDK-8332740](https://bugs.openjdk.org/browse/JDK-8332740) due to a build failure in the microbenchmarks. ------------- Commit messages: - Merge remote-tracking branch 'origin/master' into JDK-8332744 - Use jdk.internal.misc.Unsafe instead of sun.misc.Unsafe in microbenchmarks to avoid a sunapi warning - [REDO] 'internal proprietary API' diagnostics if --system is configured to an earlier JDK version Changes: https://git.openjdk.org/jdk/pull/19397/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19397&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8332744 Stats: 159 lines in 20 files changed: 132 ins; 0 del; 27 mod Patch: https://git.openjdk.org/jdk/pull/19397.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/19397/head:pull/19397 PR: https://git.openjdk.org/jdk/pull/19397
