RFR: Merge jdk8u:master

[Andrew John Hughes]

Merge jdk8u342-b06

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Commit messages:
 - Merge jdk8u342-b06
 - 8285591: [11] add signum checks in DSA.java engineVerify

The merge commit only contains trivial merges, so no merge-specific webrevs have been generated.

Changes: https://git.openjdk.org/shenandoah-jdk8u/pull/20/files
  Stats: 3 lines in 1 file changed: 1 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/shenandoah-jdk8u/pull/20.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah-jdk8u.git pull/20/head:pull/20

PR: https://git.openjdk.org/shenandoah-jdk8u/pull/20