tcg-sparc: Implement neg.
The fallback implementation of "ret = 0 - arg1" isn't ideal, first because of the extra tcg op to load the zero, and second because we fail to handle zero as %g0 for arg1 of the sub. Signed-off-by: NRichard Henderson <rth@twiddle.net> Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>
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