Implement ES5 erratum: global declarations shadow inherited properties.

test/mjsunit/regress/regress-115452.js

Index: test/mjsunit/regress/regress-115452.js
diff --git a/test/mjsunit/regress/regress-115452.js b/test/mjsunit/regress/regress-115452.js
index 7e424ed88b049549e62cadd0a1b83e71fc40ff34..e5a4035517fdfc8ff223b7c5b4958ce505550368 100644
--- a/test/mjsunit/regress/regress-115452.js
+++ b/test/mjsunit/regress/regress-115452.js
@@ -38,11 +38,10 @@ assertSame(1, this.foobl);
 assertFalse(Object.getOwnPropertyDescriptor(this, "foobl").writable);
 
 print(2)
-eval("function foobl() {}");
+try {
+  eval("function foobl() {}");  // Should throw.
+  assertUnreachable();
+} catch (e) {
+  assertInstanceof(e, TypeError);
+}
 assertSame(1, this.foobl);
-assertFalse(Object.getOwnPropertyDescriptor(this, "foobl").writable);
-
-print(3)
-eval("function foobl() {}");
-assertSame(1, this.foobl);
-assertFalse(Object.getOwnPropertyDescriptor(this, "foobl").writable);