Reid Kleckner 7724d08fc6 Add range adapters predecessors() and successors() for BBs
Use them in two isolated transforms so we know they work and aren't dead
code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228173 91177308-0d34-0410-b5e6-96231b3b80d8
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