Depends on https://reviews.llvm.org/D71902.
The last in a series of six patches that ports the LLVM coroutines
passes to the new pass manager infrastructure.
This patch has Clang schedule the new coroutines passes when the
-fexperimental-new-pass-manager option is used. With this and the
previous 5 patches, Clang is capable of building and successfully
running the test suite of large coroutines projects such as