[jdk15u-dev] RFR: 8261169: Upgrade HarfBuzz to the latest 2.8.0

[Dmitry Cherepanov]

Clean backport.

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Commit messages:
 - Backport 80323b7f66541e24177d02cc668a2eb9267962b9

Changes: https://git.openjdk.java.net/jdk15u-dev/pull/148/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk15u-dev&pr=148&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8261169
  Stats: 13120 lines in 123 files changed: 7021 ins; 2757 del; 3342 mod
  Patch: https://git.openjdk.java.net/jdk15u-dev/pull/148.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk15u-dev pull/148/head:pull/148

PR: https://git.openjdk.java.net/jdk15u-dev/pull/148