[jdk17] RFR: JDK-8269150 Unicode \u005C not treated as an escaping backslash [v2]

[Jim Laskey]

> \u005C Unicode escape sequence not being treated as a backslash for general escape sequences.

Jim Laskey 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 two additional commits since the last revision:

 - Merge branch 'master' into 8269150
 - Correct unicode escape handling in UnicodeReader, added test

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Changes:
  - all: https://git.openjdk.java.net/jdk17/pull/126/files
  - new: https://git.openjdk.java.net/jdk17/pull/126/files/3faf4092..8293b8c5

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk17&pr=126&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk17&pr=126&range=00-01

  Stats: 63 lines in 3 files changed: 58 ins; 4 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk17/pull/126.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17 pull/126/head:pull/126

PR: https://git.openjdk.java.net/jdk17/pull/126