[llvm-ar] ADDLIB via command line

Hi all,

I was hoping to gauge the support of adding to llvm-ar the equivalent command line functionality as the ADDLIB MRI script command. ADDLIB is used to add the contents of an archive to another archive and is currently only available in llvm-ar (and gnu-ar) through the use of an MRI script.

With the use of a new modifier, archive files can treated in the manner above when added to another archive.

Any thoughts or suggestions would be appreciated.