[jdk17] RFR: JDK-8269150 Unicode \u005C not treated as an escaping backslash [v7]

[Jim Laskey]

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

Jim Laskey has updated the pull request incrementally with one additional commit since the last revision:

  Update UnicodeBackslash test to be easier to follow

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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/67efad99..cfc1614c

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk17&pr=126&range=06
 - incr: https://webrevs.openjdk.java.net/?repo=jdk17&pr=126&range=05-06

  Stats: 28 lines in 1 file changed: 3 ins; 2 del; 23 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