[jdk17u-dev] RFR: 8267517: async logging for stdout and stderr [v2]

[Xin Liu]

> This PR backports JDK-8267517 to jdk17u. -Xlog:async will route LogOutput stdout/stderr to the asynchronous logging queue like ordinary log files. The reason we do is that some Java application outputs logs to stdout/stderr and redirect them to files then. 
> 
> This is **NOT** a clean backport. It's because jdk17u is missing a few patches, such as JDK-8273471, JDK-8269004. I tried to backport them beforehand, but they both have dependencies.  I manually resolve a couple of conflicts. 
> 
> We have verified patch like how we verified for jdk-tip. We output verbose gclog to stdout `-Xlog:gc=trace:stdout` and leverage software flow control to pause our console(C-s). Java threads don't be blocked with '-Xlog:async'. Without this patch, kernel puts Java threads which require GC to 'sleep' state when unified log is blocked.
> 
> ---------
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Xin Liu has updated the pull request incrementally with one additional commit since the last revision:

  update per feedback

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

Changes:
  - all: https://git.openjdk.org/jdk17u-dev/pull/1555/files
  - new: https://git.openjdk.org/jdk17u-dev/pull/1555/files/e34247cb..855a095d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1555&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1555&range=00-01

  Stats: 2 lines in 1 file changed: 1 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1555.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1555/head:pull/1555

PR: https://git.openjdk.org/jdk17u-dev/pull/1555