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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173423 91177308-0d34-0410-b5e6-96231b3b80d8
ArrayRef reverse iterators.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173424 91177308-0d34-0410-b5e6-96231b3b80d8
MIsched: Improve the interface to SchedDFS analysis (subtrees).

Allow the strategy to select SchedDFS. Allow the results of SchedDFS
to affect initialization of the scheduler state.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173425 91177308-0d34-0410-b5e6-96231b3b80d8