[AIX] Emit version string in .file directive

AIX .file directive support including compiler version string.
https://www.ibm.com/docs/en/aix/7.2?topic=ops-file-pseudo-op

This patch adds the support so that it will be easier to identify build
compiler in objects.

Reviewed By: #powerpc, shchenz

Differential Revision: https://reviews.llvm.org/D105743