Merge pull request #680 from ethcore/uint_mem

Adding std::mem back (only for asm)

util/bigint/src/uint.rs

@@ -36,6 +36,9 @@
 //! The functions here are designed to be fast.
 //!
 
+
+#[cfg(all(asm_available, target_arch="x86_64"))]
+use std::mem;
 use std::fmt;
 use std::cmp;