fixes #52, fields shadowing getters/setters or other fields

test/codegen/expect/BenchmarkBase.js

Index: test/codegen/expect/BenchmarkBase.js
diff --git a/test/codegen/expect/BenchmarkBase.js b/test/codegen/expect/BenchmarkBase.js
index 33c7b2e6adeafe8a746344a62138b165cd38cdce..19dbead5b686e0c75e118737463ed014093a356a 100644
--- a/test/codegen/expect/BenchmarkBase.js
+++ b/test/codegen/expect/BenchmarkBase.js
@@ -19,9 +19,13 @@ var BenchmarkBase;
       throw message;
     }
   }
+  let name$ = Symbol('name');
   class BenchmarkBase extends core.Object {
+    get name() {
+      return this[name$];
+    }
     BenchmarkBase(name) {
-      this.name = name;
+      this[name$] = name;
     }
     run() {}
     warmup() {