[mlir][arith] Add nneg to extui and uitofp. (#183165) This patchset adds missing the missing flag nneg (non-negative) to extui and uitofp which denotes that the operand is known to be non-negative. Semantics for this flag mirrors LLVM semantics. [From:](https://discourse.llvm.org/t/rfc-add-zext-nneg-flag/73914) > If the nneg flag is set, and the zext argument is negative, the result is a poison value. > A corollary is that replacing a zext nneg with sext is a refinement. [and](https://discourse.llvm.org/t/rfc-support-nneg-flag-with-uitofp/77988): > uitofp nneg iN %x to fM returns poison if %x is negative > A corollary is that uitofp nneg iN %x to fM is equivilent to sitofp iN %x to fM. * Adds ArithNonNegFlagInterface * Adds AttrConvertNonNegToLLVM * Updates definitions of arith.extui and arith.uitofp to declare ArithNonNegFlagInterface * Updates canonicalization patterns to propagate nneg where applicable * Adds roundtrip, lowering, and canonicalization tests. Assisted-by: claude
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