RFR: JDK-8263261 Extend String::translateEscapes to support unicode escapes [v10]

[Jim Laskey]

> Currently String::translateEscapes does not support unicode escapes, reported as a IllegalArgumentException("Invalid escape sequence: ..."). String::translateEscapes should translate unicode escape sequences to provide full coverage,

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

  Requested changes

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Changes:
  - all: https://git.openjdk.org/jdk/pull/17491/files
  - new: https://git.openjdk.org/jdk/pull/17491/files/8fd58b55..f0ea4bc9

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17491&range=09
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17491&range=08-09

  Stats: 21 lines in 2 files changed: 7 ins; 0 del; 14 mod
  Patch: https://git.openjdk.org/jdk/pull/17491.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17491/head:pull/17491

PR: https://git.openjdk.org/jdk/pull/17491