RFR: JDK-8320005 : Allow loading of shared objects with .a extension on AIX [v15]

[Suchismith Roy]

> J2SE agent does not start and throws error when it tries to find the shared library ibm_16_am.
> After searching for ibm_16_am.so ,the jvm agent throws and error as dll_load fails.It fails to identify the shared library ibm_16_am.a shared archive file on AIX.
> Hence we are providing a function which will additionally search for .a file on AIX ,when the search for .so file fails.

Suchismith Roy has updated the pull request incrementally with one additional commit since the last revision:

  change control flow

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Changes:
  - all: https://git.openjdk.org/jdk/pull/16604/files
  - new: https://git.openjdk.org/jdk/pull/16604/files/f4c1788b..14e0ed39

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16604&range=14
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16604&range=13-14

  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/16604.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16604/head:pull/16604

PR: https://git.openjdk.org/jdk/pull/16604