tree 680eda0df79c88c106bdc811d8042ab81e5d8e49
parent d0d07fd171a48de34454d1271befb1b06060560d
author Jez Ng <jezng@fb.com> 1610480516 -0500
committer Copybara-Service <copybara-worker@google.com> 1611278765 -0800

[lld-macho] Run ObjCContractPass during LTO

Run the ObjCARCContractPass during LTO. The legacy LTO backend (under
LTO/ThinLTOCodeGenerator.cpp) already does this; this diff just adds that
behavior to the new LTO backend. Without that pass, the objc.clang.arc.use
intrinsic will get passed to the instruction selector, which doesn't know how to
handle it.

In order to test both the new and old pass managers, I've also added support for
the `--[no-]lto-legacy-pass-manager` flags.

P.S. Not sure if the ordering of the pass within the pipeline matters...

Reviewed By: fhahn

Differential Revision: https://reviews.llvm.org/D94547

GitOrigin-RevId: 697f4e429b900d2d3d8a03713c7d6cd562a5bd35