fpu/softfloat: Split floatXX_silence_nan from floatXX_maybe_silence_nan
The new function assumes that the input is an SNaN and does not double-check. Tested-by: NAlex Bennée <alex.bennee@linaro.org> Reviewed-by: NAlex Bennée <alex.bennee@linaro.org> Reviewed-by: NPeter Maydell <peter.maydell@linaro.org> Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>
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