[MLIR][Arith] Add denormal attribute to binary/unary operations (#112700) Add support for denormal in the Arith dialect (binary and unary operations). Denormal are attached to every operation, and they can be of three different kinds: 1) ieee, denormal are preserved and processed as defined by IEEE 754 rules. 2) preserve sign, a mode where denormal numbers are flushed to zero, but the sign of the zero (+0 or -0) is preserved. 3) positive zero, a mode where all denormal numbers are flushed to positive zero (+0), ignoring the sign of the original number. Denormal refers to both the operands and the result. Currently only lowering for ieee is supported.
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