[Rev 02] RFR: 8246348: Crash in libpango on Ubuntu 20.04 with some unicode chars

[Johan Vos]

> This addresses https://bugs.openjdk.java.net/browse/JDK-8246348

Johan Vos has updated the pull request incrementally with one additional commit since the last revision:

  use LinkedHashMap instead of HashMap
  Only store the pointer to the utf8 string if its creation was successful

-------------

Changes:
  - all: https://git.openjdk.java.net/jfx/pull/249/files
  - new: https://git.openjdk.java.net/jfx/pull/249/files/998f55c6..0d6e9093

Webrevs:
 - full: https://webrevs.openjdk.java.net/jfx/249/webrev.02
 - incr: https://webrevs.openjdk.java.net/jfx/249/webrev.01-02

  Stats: 4 lines in 1 file changed: 1 ins; 1 del; 2 mod
  Patch: https://git.openjdk.java.net/jfx/pull/249.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/249/head:pull/249

PR: https://git.openjdk.java.net/jfx/pull/249