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from 5cf0f4679c3 [Verifier] Diagnose invalid DIType references instead of crashing. new ac54edee6f9 [x86] Teach the backend to fold more read-modify-write memo [...]

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Summary of changes: lib/Target/X86/X86ISelDAGToDAG.cpp | 126 ++++--- test/CodeGen/X86/add.ll | 6 +- test/CodeGen/X86/addcarry.ll | 3 +- test/CodeGen/X86/fold-rmw-ops.ll | 420 ++++++++++++++++++++++ test/CodeGen/X86/peephole-na-phys-copy-folding.ll | 20 +- test/CodeGen/X86/pr32659.ll | 6 +- 6 files changed, 507 insertions(+), 74 deletions(-) create mode 100644 test/CodeGen/X86/fold-rmw-ops.ll