Turn message property of the error object into a data property.

test/mjsunit/error-accessors.js

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-// Flags: --allow-natives-syntax --expose-gc
+// Test that the message property of error objects is a data property.
 
-DontEnum = 2;
+var o;
 
-var o = {};
-%SetProperty(o, "a", 0, DontEnum);
+// message is constructed using the constructor.
+var error1 = new Error("custom message");
+o = {};
+o.__proto__ = error1;
 
-var o2 = {};
-%SetProperty(o2, "a", 0, DontEnum);
+assertEquals("custom message",
+             Object.getOwnPropertyDescriptor(error1, "message").value);
+o.message = "another message";
+assertEquals("another message", o.message);
+assertEquals("custom message", error1.message);
 
-assertTrue(%HaveSameMap(o, o2));
+// message is constructed by the runtime.
+var error2;
+try { x.x } catch (e) { error2 = e; }
+o = {};
+o.__proto__ = error2;
 
-o.y = 2;
+assertEquals("x is not defined",
+             Object.getOwnPropertyDescriptor(error2, "message").value);
+o.message = "another message";
+assertEquals("another message", o.message);
+assertEquals("x is not defined", error2.message);
 
-for (var v in o) { print(v); }
-o = {};
-gc();
-
-for (var v in o2) { print(v); }