Inline headers give wrong results if compiled without `-O3`

[armanbilge]

Minimized code:

#include <stdio.h>
#include <x86intrin.h>
#include <float.h>
#include <limits.h>
#include <string.h>
#define SLEEF_ALWAYS_INLINE __attribute__((always_inline))
#define SLEEF_INLINE static inline
#define SLEEF_CONST const
#include <sleefinline_avx2.h>

int main(void) {
  __m256d x = _mm256_set1_pd(1.0);
  x = Sleef_expd4_u10avx2(x);
  printf("%f %f %f %f\n", x[0], x[1], x[2], x[3]);
}

If I compile with gcc -mavx2 -mfma -o bug bug.c I get: 2.718282 2.718282 1.000000 1.000000

If I compile with gcc -mavx2 -mfma -O3 -o bug bug.c I get: 2.718282 2.718282 2.718282 2.718282

I didn't try other combinations of functions or -O levels. BTW this might only be a documentation "bug" :)

Thanks for a fantastic library!