[jdk11u-dev] RFR: 8279077: JFR crashes on Linux ppc due to missing crash protector in signal handler

[Zhengyu Gu]

This is a linux_ppc specific bug, probably a day-one bug till relevant code was refactored by JDK-8255711 in 16.

Linux ppc signal handler does not install crash protector as other Linux based platforms do, e.g. linux_x86, that can result a crash while jfr tries to fill stack trace for other thread.

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Commit messages:
 - 8279077: JFR crashes on Linux ppc due to missing crash protector in signal handler

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/729/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=729&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8279077
  Stats: 4 lines in 1 file changed: 4 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/729.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/729/head:pull/729

PR: https://git.openjdk.java.net/jdk11u-dev/pull/729