Check holder before optimizing calls to global functions....

test/mjsunit/regress/regress-1106.js

Index: test/mjsunit/regress/regress-1106.js
===================================================================
--- test/mjsunit/regress/regress-1106.js	(revision 6724)
+++ test/mjsunit/regress/regress-1106.js	(working copy)
@@ -40,3 +40,11 @@
 for (i=0 ; i < 100000; ++i) {
   assertEquals(5, f());
 }
+
+// Test calls on functions defined in the prototype of the global object.
+x.gee = function() { return 42; }
+function g() { return gee(); }
+
+for (i=0 ; i < 100000; ++i) {
+  assertEquals(42, g());
+}