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

[suchismith1993]

JDK-8320005 :  Native library suffix impact on hotspot code in AIX

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Commit messages:
 - 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.

Changes: https://git.openjdk.org/jdk/pull/16604/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16604&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8320005
  Stats: 24 lines in 3 files changed: 24 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