[mlir][arith] Add rounding mode flags to binary arithmetic operations (#188458) Add rounding mode flags for `addf`, `subf`, `mulf`, `divf`. This addresses a TODO in the op description. The folder now takes into account the specified rounding mode. If no rounding mode is specified, the folders/canonicalizations default to `rmNearestTiesToEven`. (This behavior has not changed.) This is documented in the top-level arith dialect documentation. The default arith rounding mode applies only to "internal" transformations such as foldings/canonicalizations. In case of an unspecified explicit rounding mode, the runtime behavior is up to the target backend. Also add a lowering to LLVM intrinsics such as `llvm.intr.experimental.constrained.fadd`. Assisted-by: claude-4.6-opus-high
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