Intrinsics that should exist at CT

[p0nce]

Some intrinsics should exist in CTFE context in order to be able to have constants, useful when porting from C.

At a minimum:

• [x] _mm_setr_ps
• [x] _mm_set_ps
• [x] _mm_set1_ps
• [x] _mm_setr_epi32
• [x] _mm_set_epi32
• [x] _mm_set1_epi32

[p0nce]

Reopen this if you need double, shorter integers, 256 bit vectors....