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.
4a7b56e6e7