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from 467514942a5 [ConstantRange] Optimize nowrap region test, remove redunda [...] new 7bd6e166d9c [ConstantRange] makeGuaranteedNoWrapRegion(): `shl` support new 32d24a32499 [InstCombine] Shift amount reassociation in shifty sign bit [...]

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Summary of changes: lib/IR/ConstantRange.cpp | 21 ++++++ lib/Transforms/InstCombine/InstCombineCompares.cpp | 29 +++++--- lib/Transforms/InstCombine/InstCombineInternal.h | 4 ++ lib/Transforms/InstCombine/InstCombineShifts.cpp | 53 ++++++++++----- ...n-bit-test-via-right-shifting-all-other-bits.ll | 12 ++-- unittests/IR/ConstantRangeTest.cpp | 78 ++++++++++++++++++++++ 6 files changed, 165 insertions(+), 32 deletions(-)