[llvm-lipo] Support object files with bitcode asm

llvm-lipo crashes when trying to use inputs that contain bitcode asm instructions.
This happens when trying to create universal binaries for LLVM with LTO.
https://reviews.llvm.org/D118575 is a similar change that ran into this same issue, and I'm
mirroring the same change by registering the targets to fix this issue.

Reviewed By: alexander-shaposhnikov, keith

Differential Revision: https://reviews.llvm.org/D133729