Implement ES5 erratum: global declarations shadow inherited properties.

test/mjsunit/declare-locally.js

Index: test/mjsunit/declare-locally.js
diff --git a/test/mjsunit/declare-locally.js b/test/mjsunit/declare-locally.js
index 93fcb85f3c51cecef239085addb667f71f6dae6d..458ac7e9dcbbcb1bd3c9ead3b3eb94d56d75168c 100644
--- a/test/mjsunit/declare-locally.js
+++ b/test/mjsunit/declare-locally.js
@@ -36,8 +36,8 @@
 this.__proto__.foo = 42;
 this.__proto__.bar = 87;
 
-eval("assertEquals(42, foo); var foo = 87;");
+eval("assertEquals(undefined, foo); var foo = 87;");
 assertEquals(87, foo);
 
-eval("assertEquals(87, bar); const bar = 42;");
+eval("assertEquals(undefined, bar); const bar = 42;");
 assertEquals(42, bar);