Allow loading constant function from proto chain.

test/mjsunit/compiler/proto-chain-constant.js

-// Copyright 2012 the V8 project authors. All rights reserved.
+// Copyright 2013 the V8 project authors. All rights reserved.
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 // modification, are permitted provided that the following conditions are
 // met:
 //
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 //       notice, this list of conditions and the following disclaimer.
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 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Flags: --allow-natives-syntax
 
-// Test HLoadNamedField on the proto chain.
+// Test loading a constant function on the prototype chain.
 
-var obj4 = Object.create(null, { f4: {value: 4} });
-var obj3 = Object.create(obj4, { f3: {value: 3} });
-var obj2 = Object.create(obj3, { f2: {value: 2} });
-var obj1 = Object.create(obj2, { f1: {value: 1} });
-var obj0 = Object.create(obj1, { f0: {value: 0} });
+var c = Object.create;
+var obj4 = c(null, { f4: { value: function() { return 4; }, writable: true }});
+var obj3 = c(obj4, { f3: { value: function() { return 3; }, writable: true }});
+var obj2 = c(obj3, { f2: { value: function() { return 2; }, writable: true }});
+var obj1 = c(obj2, { f1: { value: function() { return 1; }, writable: true }});
+var obj0 = c(obj1, { f0: { value: function() { return 0; }, writable: true }});
 
 function get4(obj) { return obj.f4; }
 
-assertEquals(4, get4(obj0));
-assertEquals(4, get4(obj0));
+assertEquals(4, get4(obj0)());
+assertEquals(4, get4(obj0)());
 %OptimizeFunctionOnNextCall(get4);
-assertEquals(4, get4(obj0));
-assertEquals(4, get4(obj0));
+assertEquals(4, get4(obj0)());
+obj4.f4 = function() { return 5; };
+assertEquals(5, get4(obj0)());
+
+function get3(obj) { return obj.f3; }
+
+assertEquals(3, get3(obj0)());
+assertEquals(3, get3(obj0)());
+%OptimizeFunctionOnNextCall(get3);
+assertEquals(3, get3(obj0)());
+obj2.f3 = function() { return 6; };
+assertEquals(6, get3(obj0)());