RFR: 8275007: Java fails to start with null charset if LC_ALL is set to certain locales [v6]

[Naoto Sato]

> Please review the subject fix. In light of JEP400, Java runtime can/should start in UTF-8 charset if the underlying native encoding is not supported.

Naoto Sato has updated the pull request incrementally with one additional commit since the last revision:

  Move UTF-8 fallback up into initPhase1()

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/6282/files
  - new: https://git.openjdk.java.net/jdk/pull/6282/files/26d79e99..3428cdf4

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=6282&range=05
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=6282&range=04-05

  Stats: 4 lines in 1 file changed: 1 ins; 1 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6282.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6282/head:pull/6282

PR: https://git.openjdk.java.net/jdk/pull/6282