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from 5a244937201 [X86] Add DAG combine to turn (bitcast (and/or/xor (bitcast [...] new 451a188a25a [LV] Use Demanded Bits and ValueTracking for reduction type [...]

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Summary of changes: include/llvm/Transforms/Utils/LoopUtils.h | 41 ++-- lib/Transforms/Utils/LoopUtils.cpp | 216 ++++++++++++++------- lib/Transforms/Vectorize/LoopVectorize.cpp | 18 +- .../LoopVectorize/reduction-small-size.ll | 37 +++- 4 files changed, 210 insertions(+), 102 deletions(-)