updated signaling NaN definitions and optimized softfloat#604

Merged

mateoconlechuga merged 3 commits intomasterfrom

pr/opt_softfloat

May 15, 2025

Commits on May 14, 2025

Updated the definition of quiet NaN for issignaling
ZERICO2005
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implemented s_normSubnormalF64Sig in assembly to save 78 bytes and inlined functions only used by f64_to_f32 saving an additional 118 bytes
ZERICO2005
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Removed unused softfloat functions
ZERICO2005
committed