Summary:
There isn't any actual dependency - there's one #include from CodeGen
but nothing from the header is actually used.
With this change we can use the MCA library from CodeGen without
circular dependencies (e.g. for scheduling).
Reviewers: andreadb
Reviewed By: andreadb
Authored By: orodley
Subscribers: mgorny, gbedwell, llvm-commits
Differential Revision: https://reviews.llvm.org/D52288
llvm-svn: 342706