RFR: 8285517: System.getenv() returns unexpected value if environment variable has non ASCII character [v8]

[Ichiroh Takiguchi]

> On JDK19 with Linux ja_JP.eucjp locale,
> System.getenv() returns unexpected value if environment variable has Japanese EUC characters.
> It seems this issue happens because of JEP 400.
> Arguments for ProcessBuilder have same kind of issue.

Ichiroh Takiguchi has updated the pull request incrementally with one additional commit since the last revision:

  8285517: System.getenv() returns unexpected value if environment variable has non ASCII character

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8378/files
  - new: https://git.openjdk.java.net/jdk/pull/8378/files/6dbaa751..12018014

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8378&range=07
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8378&range=06-07

  Stats: 72 lines in 3 files changed: 10 ins; 2 del; 60 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8378.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8378/head:pull/8378

PR: https://git.openjdk.java.net/jdk/pull/8378