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from 81228ec5613 [X86] Improve coverage of fma negations. new 06400502e2d [memcpyopt] Teach memcpyopt to optimize across basic blocks

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Summary of changes: include/llvm/Analysis/MemoryDependenceAnalysis.h | 6 ++ lib/Analysis/MemoryDependenceAnalysis.cpp | 20 ++-- lib/Transforms/Scalar/MemCpyOptimizer.cpp | 56 ++++++++-- test/Transforms/MemCpyOpt/memcpy-invoke-memcpy.ll | 48 +++++++++ test/Transforms/MemCpyOpt/merge-into-memset.ll | 45 ++++++++ test/Transforms/MemCpyOpt/mixed-sizes.ll | 36 +++++++ .../Transforms/MemCpyOpt/nonlocal-memcpy-memcpy.ll | 114 +++++++++++++++++++++ 7 files changed, 306 insertions(+), 19 deletions(-) create mode 100644 test/Transforms/MemCpyOpt/memcpy-invoke-memcpy.ll create mode 100644 test/Transforms/MemCpyOpt/merge-into-memset.ll create mode 100644 test/Transforms/MemCpyOpt/mixed-sizes.ll create mode 100644 test/Transforms/MemCpyOpt/nonlocal-memcpy-memcpy.ll