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248ae4d5bc
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