Tests and a minor bugfix for [dcl.attr.depend]p1 (C++11 [[carries_dependency]]
attribute).


git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@173645 91177308-0d34-0410-b5e6-96231b3b80d8
Since ObjCARC has been refactored into its own library with its own declaration header, we need to include the declaration header alongside Scalar.h in BackendUtil.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@173648 91177308-0d34-0410-b5e6-96231b3b80d8