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from 3661eaade1e [LoopRotate] Unconditionally get DomTree. new 5320e7b54b6 [SLP] add test with prefer-vector-width function attribute; NFC new aef8d68ace3 MachineSSAUpdater: insert IMPLICIT_DEF at top of basic block new c54901d3607 AMDGPU: Propagate undef flag during pre-RA exec mask optimizations

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Summary of changes: lib/CodeGen/MachineSSAUpdater.cpp | 2 +- lib/Target/AMDGPU/SIOptimizeExecMaskingPreRA.cpp | 13 +-- .../AMDGPU/optimize-exec-masking-pre-ra.mir | 25 ++++- test/CodeGen/AMDGPU/si-i1-copies.mir | 28 ++++++ test/Transforms/SLPVectorizer/X86/pr19657.ll | 104 +++++++++++++++------ 5 files changed, 133 insertions(+), 39 deletions(-) create mode 100644 test/CodeGen/AMDGPU/si-i1-copies.mir