add integration test rust-lang-nursery/packed_simd
add integration test rust-lang-nursery/packed_simd

aidancully/rust,rust-lang/rustfmt,aidancully/rust,graydon/rust,graydon/rust,rust-lang/rustfmt,graydon/rust,SingingTree/rustfmt,SingingTree/rustfmt,graydon/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust