RFR: 8343149: Cleanup os::print_tos_pc on AIX

[Matthias Baesken]

The os::print_tos_pc on AIX has some TODO output, related to potential instruction decoding that can be removed.

On other platforms no instruction decoding (or TODO) is present at this place.

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Commit messages:
 - JDK-8343149

Changes: https://git.openjdk.org/jdk/pull/21740/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21740&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8343149
  Stats: 6 lines in 1 file changed: 0 ins; 6 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/21740.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21740/head:pull/21740

PR: https://git.openjdk.org/jdk/pull/21740