Fix a number of tests that incorrectly used assertUnreachable.

test/mjsunit/object-define-property.js

Index: test/mjsunit/object-define-property.js
diff --git a/test/mjsunit/object-define-property.js b/test/mjsunit/object-define-property.js
index a8a32130c433ace2cfe465e094a99e1c936048fa..e08686ec52d9cb274bda67d402e3ebcd181270f9 100644
--- a/test/mjsunit/object-define-property.js
+++ b/test/mjsunit/object-define-property.js
@@ -30,28 +30,34 @@
 // Flags: --allow-natives-syntax
 
 // Check that an exception is thrown when null is passed as object.
+var exception = false;
 try {
   Object.defineProperty(null, null, null);
-  assertTrue(false);
 } catch (e) {
+  exception = true;
   assertTrue(/called on non-object/.test(e));
 }
+assertTrue(exception);
 
 // Check that an exception is thrown when undefined is passed as object.
+exception = false;
 try {
   Object.defineProperty(undefined, undefined, undefined);
-  assertTrue(false);
 } catch (e) {
+  exception = true;
   assertTrue(/called on non-object/.test(e));
 }
+assertTrue(exception);
 
 // Check that an exception is thrown when non-object is passed as object.
+exception = false;
 try {
   Object.defineProperty(0, "foo", undefined);
-  assertTrue(false);
 } catch (e) {
+  exception = true;
   assertTrue(/called on non-object/.test(e));
 }
+assertTrue(exception);
 
 // Object.
 var obj1 = {};
@@ -695,12 +701,14 @@ Object.defineProperty(obj5, 'minuszero', descMinusZero);
 // Make sure we can redefine with -0.
 Object.defineProperty(obj5, 'minuszero', descMinusZero);
 
+exception = false;
 try {
   Object.defineProperty(obj5, 'minuszero', descPlusZero);
-  assertUnreachable();
 } catch (e) {
+  exception = true;
   assertTrue(/Cannot redefine property/.test(e));
 }
+assertTrue(exception);
 
 
 Object.defineProperty(obj5, 'pluszero', descPlusZero);
@@ -708,12 +716,14 @@ Object.defineProperty(obj5, 'pluszero', descPlusZero);
 // Make sure we can redefine with +0.
 Object.defineProperty(obj5, 'pluszero', descPlusZero);
 
+exception = false;
 try {
   Object.defineProperty(obj5, 'pluszero', descMinusZero);
-  assertUnreachable();
 } catch (e) {
+  exception = true;
   assertTrue(/Cannot redefine property/.test(e));
 }
+assertTrue(exception);
 
 
 var obj6 = {};
@@ -761,13 +771,15 @@ try {
 
 // Ensure that we can't change the descriptor of a
 // non configurable property.
+exception = false;
 try {
   var descAccessor = { get: function() { return 0; } };
   Object.defineProperty(obj6, '2', descAccessor);
-  assertUnreachable();
 } catch (e) {
+  exception = true;
   assertTrue(/Cannot redefine property/.test(e));
 }
+assertTrue(exception);
 
 Object.defineProperty(obj6, '2', descElementNonWritable);
 desc = Object.getOwnPropertyDescriptor(obj6, '2');
@@ -858,13 +870,15 @@ try {
 
 // Ensure that we can't change the descriptor of a
 // non configurable property.
+exception = false;
 try {
   var descAccessor = { get: function() { return 0; } };
   Object.defineProperty(arr, '2', descAccessor);
-  assertUnreachable();
 } catch (e) {
+  exception = true;
   assertTrue(/Cannot redefine property/.test(e));
 }
+assertTrue(exception);
 
 Object.defineProperty(arr, '2', descElementNonWritable);
 desc = Object.getOwnPropertyDescriptor(arr, '2');