[jdk11u-dev] RFR: 8264752: SIGFPE crash with option FlightRecorderOptions:threadbuffersize=30M [v2]

[Hui Shi]

> Please help review backport of JDK-8264752 related to JFR. 
> This backport also includes successive build failure fix JDK-8266206 (for older gcc version).
> 
> Applied almost cleanly on jdk11u, except copyright year in license and ClassFileInstaller build/use in test/jdk/jdk/jfr/startupargs/TestBadOptionValues.java.
> 
> Tested on Linux X64 tier1/tier2/tier3 release/fastdebug no regression.
> New test added in this PR also pass.

Hui Shi has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

  Backport 377b346189c7cff9c8d535c3a6980f86669a95a0

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Changes:
  - all: https://git.openjdk.java.net/jdk11u-dev/pull/49/files
  - new: https://git.openjdk.java.net/jdk11u-dev/pull/49/files/378d0922..bbdf0070

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=49&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=49&range=00-01

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/49.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/49/head:pull/49

PR: https://git.openjdk.java.net/jdk11u-dev/pull/49