Fix bug in regexp result object construction.

src/runtime.cc

Index: src/runtime.cc
diff --git a/src/runtime.cc b/src/runtime.cc
index f51b6878244545df68437498b6039ec0f793664a..9e44b586bd36e48807fb6a989f264d11681f0edd 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -2469,7 +2469,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_RegExpConstructResult) {
   }
   Object* new_object;
   { MaybeObject* maybe_new_object =
-        isolate->heap()->AllocateFixedArrayWithHoles(elements_count);
+        isolate->heap()->AllocateFixedArray(elements_count);
     if (!maybe_new_object->ToObject(&new_object)) return maybe_new_object;
   }
   FixedArray* elements = FixedArray::cast(new_object);