Add missing use statements for types

Author: Byron

crates/core_arch/src/arm/neon.rs

@@ -1,6 +1,10 @@
+#[allow(unused_imports)]
 use crate::core_arch::acle::neon::*;
+#[allow(unused_imports)]
 use crate::core_arch::simd_llvm::*;
 #[allow(unused_imports)]
+use crate::core_arch::simd::{i32x4, u32x4, f32x4};
+#[allow(unused_imports)]
 use crate::mem::transmute;
 
 #[cfg(test)]