[Bug target/108191] Add support to usage of *intrin.h without -mavx512f -mavx512cd

["luoyonggang at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108191

--- Comment #6 from 罗勇刚(Yonggang Luo) <luoyonggang at gmail dot com> ---
Is the following command are valid usage? It's compiled properly

```

// compile args:  -fPIC -O2 -D__SSE3__=1 -D__SSSE3__=1 -D__SSE4_1__=1
-D__SSE4_2__=1 -D__SSE4A__=1 -D__POPCNT__=1 -D__XSAVE__=1 -D__CRC32__=1
-D__AVX__=1 -D__AVX2__=1 -D__FP_FAST_FMAF32=1 -D__FP_FAST_FMAF64=1
-D__FP_FAST_FMAF=1 -D__FP_FAST_FMAF32x=1 -D__AVX512F__=1 -D__AVX512CD__=1
#include <math.h>

#pragma GCC push_options
#pragma GCC target("avx512f")
#pragma GCC target("avx512cd")
#pragma GCC target("sse4a")

#if defined(_MSC_VER)
#include <intrin.h>
#else
#include <x86intrin.h>
#endif

#pragma GCC pop_options


#pragma GCC push_options
#pragma GCC target("avx512f")
#pragma GCC target("avx512cd")
#pragma GCC target("sse4a")

void util_fadd_512(float *a, float *b, float *c) {
    /* a = b + c */
    __m512 av = _mm512_load_ps(a);
    __m512 bv = _mm512_load_ps(b);
    __m512 cv = _mm512_add_ps(av, bv);
    _mm512_store_ps(c, cv);
}
static inline int
util_iround(float f)
{
   __m128 m = _mm_set_ss(f);
   return _mm_cvtss_i32(m);
}

#pragma GCC pop_options

int util_iround_outside(int x, float y) {
    return x + util_iround(y);
}
float util_fadd(float a, float b) {
   return a + b;
}
```