[jdk8u-dev] RFR: Merge jdk8u:master

[Andrew John Hughes]

Bring in jdk8u382-b04

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

Commit messages:
 - Merge jdk8u:master
 - 8241311: Move some charset mapping tests from closed to open
 - 8186801: Add regression test to test mapping based charsets (generated at build time)

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

Changes: https://git.openjdk.org/jdk8u-dev/pull/338/files
  Stats: 887690 lines in 180 files changed: 887689 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/338.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev.git pull/338/head:pull/338

PR: https://git.openjdk.org/jdk8u-dev/pull/338