Avoid creating a reference to a reference.

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

lib/cretonne/src/regalloc/coalescing.rs

@@ -468,7 +468,7 @@ impl<'a> Context<'a> {
     /// Leave `self.values` unchanged on failure.
     fn add_class(&mut self, value: Value) -> Result<(), (Value, Value)> {
         self.forest.try_merge(
-            &self.values,
+            self.values,
             self.virtregs.congruence_class(&value),
             &self.func.dfg,
             &self.func.layout,

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[global_index as usize];
+        let glob = self.globals[global_index as usize];
         match glob.ty {
             I32 => builder.ins().iconst(glob.ty, -1),
             I64 => builder.ins().iconst(glob.ty, -1),