RFR: Merge jdk8u:master

[Andrew John Hughes]

Merge jdk8u432-b01

GHA builds will not work until [JDK-8293107](https://bugs.openjdk.org/browse/JDK-8293107) is merged in 8u462-b01

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Commit messages:
 - Merge jdk8u432-b01
 - Merge
 - 8307779: Relax the java.awt.Robot specification
 - 8318039: GHA: Bump macOS and Xcode versions
 - 8330415: Update system property for Java SE specification maintenance version
 - 8320964: sun/tools/native2ascii/Native2AsciiTests.sh fails on Japanese
 - 8305931: jdk/jfr/jcmd/TestJcmdDumpPathToGCRoots.java failed with "Expected chains but found none"
 - 8299677: Formatter.format might take a long time to format an integer or floating-point
 - 8075511: Enable -Woverloaded-virtual C++ warning for HotSpot build
 - 8335552: [8u] JDK-8303466 backport to 8u requires 3 ::Identity signature fixes
 - ... and 16 more: https://git.openjdk.org/shenandoah-jdk8u/compare/4dde0ed1...fb363c38

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - master: https://webrevs.openjdk.org/?repo=shenandoah-jdk8u&pr=78&range=00.0
 - jdk8u:master: https://webrevs.openjdk.org/?repo=shenandoah-jdk8u&pr=78&range=00.1

Changes: https://git.openjdk.org/shenandoah-jdk8u/pull/78/files
  Stats: 6992 lines in 73 files changed: 2023 ins; 3189 del; 1780 mod
  Patch: https://git.openjdk.org/shenandoah-jdk8u/pull/78.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah-jdk8u.git pull/78/head:pull/78

PR: https://git.openjdk.org/shenandoah-jdk8u/pull/78