Implement all x86 AES-NI vendor intrinsics

[ruuda]

#40 makes no mention of the AES-NI intrinsics, so I am opening an issue to track them here. See also the Intel intrinsics guide.

• _mm_aesdec_si128
• _mm_aeskeygenassist_si128
• _mm_aesenc_si128
• _mm_aesenclast_si128
• _mm_aesimc_si128
• _mm_aesdeclast_si128

[gnzlbg]

So once rust-lang/rust#47822 is merged this can be implemented.

In MSDN there are examples of each of these intrinsics that can be used to create some tests: https://msdn.microsoft.com/de-de/library/cc714206(v=vs.100).aspx

[ruuda]

Thanks for opening the whitelist PR @gnzlbg.

I will take a shot at implementing the intrinsics in this issue.