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
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...