[AIX] Align the content of an xcoff object file which has auxiliary header in big archive.

Summary:

if the member file is XCOFF object file and has auxiliary header, the content of the member file need to be aligned at the
MAX(maximum alignment of .text , maximum alignment of .data). The "maximum alignment of .text" and "maximum alignment of .data" are two
field of auxiliary header of XCOFF object file.

Reviewers: James Henderson, Stephen Peckham
Differential Revision: https://reviews.llvm.org/D144872