Avx (rust-lang#105)

* avx: _mm_permute_ps and sse: _mm_undefined_ps

* avx: _mm256_permutevar_pdi, _mm_permutevar_pd

* avx: _mm256_permute_pd

* avx: _mm256_shuffle_pd fixed

* avx: _mm_permute_pd, sse2: _mm_undefined_pd

* avx: _mm256_permute2f128_ps

* avx: _mm256_permute2f128_pd

* avx: _mm256_permute2f128_si256

* avx: _mm256_broadcast_ss

* avx: _mm_broadcast_ss

* avx: _mm256_broadcast_sd

* avx: _mm256_broadcast_ps

* avx: _mm256_broadcast_pd

* avx: _mm_cmp_pd

* avx: _mm256_cmp_pd

* avx: _mm_cmp_ps

* avx: _mm256_cmp_ps

* avx: _mm_cmp_sd

* avx: _mm_cmp_ss

* avx: _mm256_insertf128_pd, _mm256_castpd128_pd256

* avx: _mm256_insertf128_si256, _mm256_castsi128_si256

* avx: _mm256_insertf128_ps, _mm256_castps128_ps256

* avx: _mm256_insert_epi8

* avx: _mm256_insert_epi16

* avx: _mm256_insert_epi32

* avx: _mm256_insert_epi64

* Try to fix i586 build

* Fix missing inline and target_feature

* sse: fix _mm_undefined_ps

Author: gwenn