Put new global var semantics behind a flag until WebKit tests are cleaned up.

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 f745e1bad39da446858a16f8b257584f1eb4dbe7..dc711581e928520e4b4af80b4c95d36a8c4df363 100644
--- a/test/mjsunit/regress/regress-115452.js
+++ b/test/mjsunit/regress/regress-115452.js
@@ -27,6 +27,8 @@
 
 // Test that a function declaration cannot overwrite a read-only property.
 
+// Flags: --es52_globals
+
 function foobl() {}
 assertTrue(typeof this.foobl == "function");
 assertTrue(Object.getOwnPropertyDescriptor(this, "foobl").writable);