RFR: 8329653: JLILaunchTest fails on AIX after JDK-8329131 [v2]

[Joachim Kern]

> Since ~ end of March, after [JDK-8329131](https://bugs.openjdk.org/browse/JDK-8329131), tools/launcher/JliLaunchTest.java fails on AIX. Failure is :
> 
>  stdout: [];
>  stderr: [Error: could not find libjava.so
> Error: Could not find Java SE Runtime Environment.
> ]
>  exitValue = 2
> 
> java.lang.RuntimeException: Expected to get exit value of [0], exit value is: [2]
> at jdk.test.lib.process.OutputAnalyzer.shouldHaveExitValue(OutputAnalyzer.java:521)
> at JliLaunchTest.main(JliLaunchTest.java:58)
> at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
> at java.base/java.lang.reflect.Method.invoke(Method.java:580)
> at com.sun.javatest.regtest.agent.MainActionHelper$AgentVMRunnable.run(MainActionHelper.java:333)
> at java.base/java.lang.Thread.run(Thread.java:1575)
> 
> Maybe we need to do further adjustments to BUILD_JDK_JTREG_EXECUTABLES_LIBS_exeJliLaunchTest / BUILD_JDK_JTREG_EXECUTABLES_LDFLAGS_exeJliLaunchTest on AIX ?
> Or somehow adjust the coding that attempts to find parts of "JRE" (libjava.so) ? The libjli.so is gone on AIX after [JDK-8329131](https://bugs.openjdk.org/browse/JDK-8329131), and with this also the image discovery based on GetApplicationHomeFromDll which uses libjli.so .
> 
> Without libjli.so we have to analyze the LD-LIBRARY_PATH / LIBPATH envvar. There is no other methos available on AIX, because it lacks the $ORIGIN feature of the rpath.

Joachim Kern has updated the pull request incrementally with one additional commit since the last revision:

  only for AIX

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/19000/files
  - new: https://git.openjdk.org/jdk/pull/19000/files/d2fac20e..caf806b3

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=19000&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19000&range=00-01

  Stats: 9 lines in 3 files changed: 5 ins; 2 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/19000.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19000/head:pull/19000

PR: https://git.openjdk.org/jdk/pull/19000