Softfloat fcvt.{w/h}.s now returns -MaxInt for -NaN

Behavior now consistent with RISC-V user spec.

softfloat/f32_to_i32.c

@@ -21,7 +21,6 @@ int_fast32_t f32_to_i32( float32_t a, int_fast8_t roundingMode, bool exact )
     sign = signF32UI( uiA );
     exp = expF32UI( uiA );
     sig = fracF32UI( uiA );
-    if ( ( exp == 0xFF ) && sig ) sign = 0;
     if ( exp ) sig |= 0x00800000;
     sig64 = (uint_fast64_t) sig<<32;
     shiftCount = 0xAF - exp;

softfloat/f32_to_i64.c

@@ -25,7 +25,7 @@ int_fast64_t f32_to_i64( float32_t a, int_fast8_t roundingMode, bool exact )
     shiftCount = 0xBE - exp;
     if ( shiftCount < 0 ) {
         softfloat_raiseFlags( softfloat_flag_invalid );
-        if ( ! sign || ( ( exp == 0xFF ) && sig ) ) {
+        if ( ! sign ) {
             return INT64_C( 0x7FFFFFFFFFFFFFFF );
         }
         return - INT64_C( 0x7FFFFFFFFFFFFFFF ) - 1;