RFR: JDK-8320005 : Native library suffix impact on hotspot code in AIX [v4]

[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 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 eight new commits since the last revision:

 - merge pr/16920
 - change macro position
 - Adapt hotspot coding style
 - Improve comments and coding style.
 - Remove macro for file extension.
 - Move mapping function to aix specific file.
 - Introduce new macro for AIX archives.
 - Add support for .a extension in jvm agent.
   1. Add support to load archive files and shared objects in jvm agent for AIX.

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/16604/files
  - new: https://git.openjdk.org/jdk/pull/16604/files/151f6c20..eb09224d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16604&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16604&range=02-03

  Stats: 3 lines in 2 files changed: 0 ins; 3 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