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from db9807d302d [WebAssembly] Revert r342701, "Add WebAssembly to LLVM_ALL_ [...] new 1269b2af10e Merge clang's isRepeatedBytePattern with LLVM's isBytewiseValue new 469bae00242 [ADT] restrict bit_cast to trivially-constructible To

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Summary of changes: include/llvm/ADT/bit.h | 18 ++--- include/llvm/Analysis/ValueTracking.h | 3 +- lib/Analysis/ValueTracking.cpp | 94 ++++++++++++++++--------- lib/Transforms/Scalar/LoopIdiomRecognize.cpp | 7 ++ lib/Transforms/Scalar/MemCpyOptimizer.cpp | 5 +- test/Transforms/MemCpyOpt/fca2memcpy.ll | 33 +++++++-- test/Transforms/MemCpyOpt/memcpy-to-memset.ll | 98 +++++++++++++++++++++++---- 7 files changed, 192 insertions(+), 66 deletions(-)