Avoid clone() on a Copy type.

https://github.com/rust-lang-nursery/rust-clippy/wiki#clone_on_copy

lib/wasm/src/code_translator.rs

@@ -567,7 +567,7 @@ fn translate_operator(
                             acc.insert(depth as usize, branch_ebb);
                             return acc;
                         };
-                        let branch_ebb = acc[&(depth as usize)].clone();
+                        let branch_ebb = acc[&(depth as usize)];
                         builder.insert_jump_table_entry(jt, index, branch_ebb);
                         acc
                     });

lib/wasm/src/module_translator.rs

@@ -108,7 +108,7 @@ pub fn translate_module(
                                     runtime.declare_memory(mem);
                                 }
                                 Import::Global(glob) => {
-                                    runtime.declare_global(glob.clone());
+                                    runtime.declare_global(glob);
                                     globals.push(glob);
                                 }
                                 Import::Table(tab) => {

lib/wasm/src/sections_translator.rs

@@ -211,7 +211,7 @@ pub fn parse_global_section(
             mutability: mutability != 0,
             initializer: initializer,
         };
-        runtime.declare_global(global.clone());
+        runtime.declare_global(global);
         globals.push(global);
         match *parser.read() {
             ParserState::EndGlobalSectionEntry => (),