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Commit d8a57c77 authored by Slava Zakharin's avatar Slava Zakharin
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[mlir][arith] Canonicalization patterns for subi. 

subi(addi(a, b), b) -> a
subi(addi(a, b), a) -> b
subi(subi(a, b), a) -> subi(0, b)

Differential Revision: https://reviews.llvm.org/D133615
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