Change calls to undefined property setters to not throw (fixes issue 1355).

test/mjsunit/getter-in-prototype.js

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-// Test that exceptions are thrown when setting properties on object
-// that have only a getter in a prototype object.
+// Test that exceptions are not thrown when setting properties on object
+// that have only a getter in a prototype object, except when we are in strict
+// mode where exceptsions should be thrown.
 
 var o = {};
 var p = {};
 p.__defineGetter__('x', function(){});
 p.__defineGetter__(0, function(){});
 o.__proto__ = p;
 
-assertThrows("o.x = 42");
-assertThrows("o[0] = 42");
+assertDoesNotThrow("o.x = 42");
+assertDoesNotThrow("o[0] = 42");
+
+assertThrows(function() { 'use strict'; o.x = 42; });
+assertThrows(function() { 'use strict'; o[0] = 42; });
 
 function f() {
   with(o) {
     x = 42;
   }
 }
-assertThrows("f()");
+
+assertDoesNotThrow(f);
 
 __proto__ = p;
 function g() {
   eval('1');
   x = 42;
 }
-assertThrows("g()");
+
+function g_strict() {
+  'use strict';
+  eval('1');
+  x = 42;
+}
+
+assertDoesNotThrow(g);
+assertThrows(g_strict);
 
 __proto__ = p;
 function g2() {
   this[0] = 42;
 }
-assertThrows("g2()");
+
+function g2_strict() {
+  'use strict';
+  this[0] = 42;
+}
+
+assertDoesNotThrow(g2);
+assertThrows(g2_strict);