[coroutines] Part 3 of N: Adding Boilerplate for Coroutine Passes

This adds boilerplate code for all coroutine passes,
the passes are no-ops for now.
Also, a small test has been added to verify that passes execute in
the expected order or not at all if coroutine support is disabled.

Patch by Gor Nishanov!

Differential Revision: https://reviews.llvm.org/D22847

llvm-svn: 277033
diff --git a/llvm/lib/Transforms/CMakeLists.txt b/llvm/lib/Transforms/CMakeLists.txt
index 2bb6e90..67bdeb2 100644
--- a/llvm/lib/Transforms/CMakeLists.txt
+++ b/llvm/lib/Transforms/CMakeLists.txt
@@ -6,3 +6,4 @@
 add_subdirectory(Vectorize)
 add_subdirectory(Hello)
 add_subdirectory(ObjCARC)
+add_subdirectory(Coroutines)