[Headers][X86] Allow MMX/SSE2/AVX2/AVX512BW integer saturated arithmetic...

[Headers][X86] Allow MMX/SSE2/AVX2/AVX512BW integer saturated arithmetic intrinsics to be used in constexpr (#153088)

This PR allows the following MMX/SSE2/AVX2/AVX512BW integer saturated arithmetic intrinsics to be used in constexpr
```
_mm_adds_pi8
_mm_adds_pi16
_mm_subs_pi8
_mm_subs_pi16

_mm_adds_pu8
_mm_adds_pu16
_mm_subs_pu8
_mm_subs_pu16

_mm_adds_epi8
_mm_adds_epi16
_mm_subs_epi8
_mm_subs_epi16

_mm_adds_epu8
_mm_adds_epu16
_mm_subs_epu8
_mm_subs_epu16

_mm256_adds_epi8
_mm256_adds_epi16
_mm256_subs_epi8
_mm256_subs_epi16

_mm256_adds_epu8
_mm256_adds_epu16
_mm256_subs_epu8
_mm256_subs_epu16

_mm512_adds_epi8
_mm512_adds_epi16
_mm512_subs_epi8
_mm512_subs_epi16

_mm512_adds_epu8
_mm512_adds_epu16
_mm512_subs_epu8
_mm512_subs_epu16
```

Fixes #152506

---------

Co-authored-by: Simon Pilgrim <llvm-dev@redking.me.uk>