RFR: 8340830: Console.readLine() and Console.printf() are mutually blocking [v4]

[Naoto Sato]

> Fixing an issue in Console where write is blocked if other thread is waiting to read, which is caused by unnecessary read/write locks. Removing those would solve the problem, as the read/write synchronization is performed at the StreamEn/Decoder level. One unrelated change is to refactor double-checked locking with LazyConstant.

Naoto Sato has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains six additional commits since the last revision:

 - added jline test run
 - Merge branch 'master' into JDK-8340830-Console-readLine-printf-mutually-blocking
 - Fixed indentation
 - Made ProxyingConsole value-based, used anonymous class for LazyConstant
 - Refine exceptions
 - initial commit

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Changes:
  - all: https://git.openjdk.org/jdk/pull/29493/files
  - new: https://git.openjdk.org/jdk/pull/29493/files/84bb6ea4..a71f4c96

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=29493&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=29493&range=02-03

  Stats: 28623 lines in 342 files changed: 15782 ins; 11564 del; 1277 mod
  Patch: https://git.openjdk.org/jdk/pull/29493.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29493/head:pull/29493

PR: https://git.openjdk.org/jdk/pull/29493