softfloat: enforce softfloat if the host's FMA is broken
The added branch to the FMA ops is marked as unlikely and therefore its impact on performance (measured with fp-bench) is within noise range when measured on an Intel(R) Xeon(R) Gold 6142 CPU @ 2.60GHz. Reported-by: NLaurent Desnogues <laurent.desnogues@gmail.com> Signed-off-by: NEmilio G. Cota <cota@braap.org> Reviewed-by: NRichard Henderson <richard.henderson@linaro.org> Signed-off-by: NAlex Bennée <alex.bennee@linaro.org>
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