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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44 91177308-0d34-0410-b5e6-96231b3b80d8

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+* The dropAllReferences code can be a noop when NDEBUG!!!
 * Finish xvcg output
 * pred/succ iterators on basic blocks don't handle switch statements correctly
 * Enhance BB to make predecessor handling easier (to update PHI nodes)