8264752: SIGFPE crash with option FlightRecorderOptions:threadbuffersize=30M

[huishi-hs]

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.

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Progress

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Issue

• JDK-8264752: SIGFPE crash with option FlightRecorderOptions:threadbuffersize=30M ⚠️ Issue is not open.

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.java.net/jdk11u-dev pull/49/head:pull/49
$ git checkout pull/49

Update a local copy of the PR:
$ git checkout pull/49
$ git pull https://git.openjdk.java.net/jdk11u-dev pull/49/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 49

View PR using the GUI difftool:
$ git pr show -t 49

Using diff file

Download this PR as a diff file:
https://git.openjdk.java.net/jdk11u-dev/pull/49.diff

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[mlbridge]

Webrevs

• 01: Full - Incremental (bbdf0070)
• 00: Full (378d0922)