[BasicAA] Make BasicAA a cfg pass.
Summary: Part of the changes in D44564 made BasicAA not CFG only due to it using PhiAnalysisValues which may have values invalidated. Subsequent patches (rL340613) appear to have addressed this limitation. BasicAA should not be invalidated by non-CFG-altering passes. A concrete example is MemCpyOpt which preserves CFG, but we are testing it invalidates BasicAA. llvm-dev RFC: https://groups.google.com/forum/#!topic/llvm-dev/eSPXuWnNfzM Reviewers: john.brawn, sebpop, hfinkel, brzycki Subscribers: hiraditya, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D74353 (cherry picked from commit 0cecafd6)
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