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from 3f631b8 GlobalISel: add buildUndef method to MachineIRBuilder. NFC. new 08e9d0e [X86] Fix arg copy elision for illegal types new 87b7f7e NewGVN: Only call isInstructionTrivially dead once per instruction. new c7849f8 NewGVN: Remove DebugUnknownExprs, just mark the instructions [...] new f0a0c23 [InstSimplify] add tests for vector div/rem with UB potential; NFC

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Summary of changes: lib/Target/X86/X86ISelLowering.cpp | 70 +++++++++++++++++-------------------- lib/Transforms/Scalar/NewGVN.cpp | 29 +++++++-------- test/CodeGen/X86/arg-copy-elide.ll | 6 ++-- test/Transforms/InstSimplify/div.ll | 42 ++++++++++++++++++++++ test/Transforms/InstSimplify/rem.ll | 42 ++++++++++++++++++++++ 5 files changed, 132 insertions(+), 57 deletions(-)