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unknown user pushed a change to branch master in repository llvm.

from e9dc79169d5 [TargetLowering] try harder to determine undef elements of [...] new 488b40bd2e1 [X86][SSE] Use PSLLDQ/PSRLDQ to mask out zeroable ends of a [...] new 3ebe457432b [SDAG] improve variable names; NFC

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Summary of changes: include/llvm/CodeGen/SelectionDAG.h | 6 +- lib/CodeGen/SelectionDAG/SelectionDAG.cpp | 45 +++++----- lib/Target/X86/X86ISelLowering.cpp | 73 ++++++++++++++++ test/CodeGen/X86/buildvec-extract.ll | 59 +++++-------- test/CodeGen/X86/vector-shuffle-128-v16.ll | 117 +++++++++++-------------- test/CodeGen/X86/vector-shuffle-128-v8.ll | 135 +++++++++++++++-------------- test/CodeGen/X86/vector-shuffle-sse4a.ll | 5 +- 7 files changed, 246 insertions(+), 194 deletions(-)