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from 276965a5768 [X86][SSE] Avoid unnecessary PMOVZX in v4i8 sum reduction new c88bcb84595 [NFC][LoopIdiom] Move one bcmp test into the proper place new d31582e52fe [NFC][LoopIdiom] Add bcmp loop idiom miscompile test from PR43206. new 3e0f2dcf49f [LoopIdiomRecognize] Recommit: BCmp loop idiom recognition

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Summary of changes: docs/ReleaseNotes.rst | 3 + lib/Transforms/Scalar/LoopIdiomRecognize.cpp | 878 +++++++++++++++++++- test/Transforms/LoopIdiom/bcmp-basic.ll | 896 +++++++++------------ test/Transforms/LoopIdiom/bcmp-debugify-remarks.ll | 119 ++- test/Transforms/LoopIdiom/bcmp-negative-tests.ll | 80 +- test/Transforms/LoopIdiom/bcmp-widening.ll | 2 +- 6 files changed, 1365 insertions(+), 613 deletions(-)