Properly handle non-JSFunction constructors in CanRetainOtherContext

test/mjsunit/regress/regress-filter-contexts.js

Index: test/mjsunit/regress/regress-filter-contexts.js
diff --git a/test/mjsunit/regress/regress-449291.js b/test/mjsunit/regress/regress-filter-contexts.js
similarity index 67%
copy from test/mjsunit/regress/regress-449291.js
copy to test/mjsunit/regress/regress-filter-contexts.js
index fb56027b67f3f176f1432c11b39075aec6cc8429..d2abe0032548428324afd6675a7031bf53a5e56e 100644
--- a/test/mjsunit/regress/regress-449291.js
+++ b/test/mjsunit/regress/regress-filter-contexts.js
@@ -4,16 +4,11 @@
 
 // Flags: --allow-natives-syntax
 
-a = {y:1.5};
-a.y = 1093445778;
-b = a.y;
-c = {y:{}};
-
-function f() {
-  return {y: b};
-}
+function f() { return f.x; }
+f.__proto__ = null;
+f.prototype = "";
 
 f();
 f();
 %OptimizeFunctionOnNextCall(f);
-assertEquals(f().y, 1093445778);
+f();