Move AES vendor intrinsics from x86_64 to i686

Although i686 does not have the AES New Instructions, making code
compatible across x86 and x64_64 tends to be easier if the intrinsics
are available everywhere.

Author: ruuda

Diff for: coresimd/src/x86/x86_64/aes.rs renamed to coresimd/src/x86/i686/aes.rs

@@ -1,5 +1,8 @@
 //! `i686` intrinsics
 
+mod aes;
+pub use self::aes::*;
+
 mod mmx;
 pub use self::mmx::*;
 

Diff for: coresimd/src/x86/i686/mod.rs

@@ -23,9 +23,6 @@ pub use self::xsave::*;
 mod abm;
 pub use self::abm::*;
 
-mod aes;
-pub use self::aes::*;
-
 mod avx;
 pub use self::avx::*;