ARM: Return correct result for float-to-integer conversion of NaN

The ARM architecture mandates that converting a NaN value to
integer gives zero (if Invalid Operation FP exceptions are
not being trapped). This isn't the behaviour of the SoftFloat
library, so NaNs must be special-cased.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Nathan Froyd <froydnj@codesourcery.com>

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