Use [] instead of .get().unwrap().

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

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.get(&(depth as usize)).unwrap().clone();
+                        let branch_ebb = acc[&(depth as usize)].clone();
                         builder.insert_jump_table_entry(jt, index, branch_ebb);
                         acc
                     });

lib/wasm/src/runtime/dummy.rs

@@ -26,7 +26,7 @@ impl WasmRuntime for DummyRuntime {
         builder: &mut FunctionBuilder<Local>,
         global_index: GlobalIndex,
     ) -> Value {
-        let ref glob = self.globals.get(global_index as usize).unwrap();
+        let ref glob = self.globals[global_index as usize];
         match glob.ty {
             I32 => builder.ins().iconst(glob.ty, -1),
             I64 => builder.ins().iconst(glob.ty, -1),