Fixed remaining bugs in COW-regexp-results.

src/runtime.cc

Index: src/runtime.cc
diff --git a/src/runtime.cc b/src/runtime.cc
index afb0df0f4774c8acecc3e59c2bff4a830f942cd1..d46b390ed3566b8febcf3267fe3aab3e92a6f0a1 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -1403,8 +1403,6 @@ static Object* Runtime_RegExpCloneResult(Arguments args) {
   // Copy JSObject elements as copy-on-write.
   FixedArray* elements = FixedArray::cast(result->elements());
   if (elements != Heap::empty_fixed_array()) {
-    ASSERT(!Heap::InNewSpace(Heap::fixed_cow_array_map()));
-    // No write barrier is necessary when writing old-space pointer.
     elements->set_map(Heap::fixed_cow_array_map());
   }
   new_array->set_elements(elements);