RFR: JDK-8292595: jdwp utf_util getWideString might leak memory [v2]

[Matthias Baesken]

> There seems to be a case where utf_util.c getWideString might leak memory in an early return.

Matthias Baesken has updated the pull request incrementally with one additional commit since the last revision:

  Introduce UTF_WARNING and use the fallback

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Changes:
  - all: https://git.openjdk.org/jdk/pull/9918/files
  - new: https://git.openjdk.org/jdk/pull/9918/files/ab7fb549..9331f320

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9918&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9918&range=00-01

  Stats: 9 lines in 1 file changed: 3 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/9918.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9918/head:pull/9918

PR: https://git.openjdk.org/jdk/pull/9918