Change sentinel value for zapping of old-to-new pointers.

R=erik.corry@gmail.com
BUG=v8:2143

Review URL: https://chromiumcodereview.appspot.com/10411089

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11630 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/mark-compact.cc

@@ -2738,7 +2738,9 @@ static void UpdatePointer(HeapObject** p, HeapObject* object) {
     // We have to zap this pointer, because the store buffer may overflow later,
     // and then we have to scan the entire heap and we don't want to find
     // spurious newspace pointers in the old space.
-    *p = reinterpret_cast<HeapObject*>(Smi::FromInt(0));
+    // TODO(mstarzinger): This was changed to a sentinel value to track down
+    // rare crashes, change it back to Smi::FromInt(0) later.
+    *p = reinterpret_cast<HeapObject*>(Smi::FromInt(0x0f100d00 >> 1)); // flood
   }
 }