Add copy constructor and assignment operator to the BitVector class.

test/cctest/test-dataflow.cc

Index: test/cctest/test-dataflow.cc
===================================================================
--- test/cctest/test-dataflow.cc	(revision 4056)
+++ test/cctest/test-dataflow.cc	(working copy)
@@ -61,6 +61,20 @@
   }
 
   {
+    BitVector v(15);
+    v.Add(0);
+    BitVector w = v;

[Kevin Millikin (Chromium), 2010/03/09 09:38:10]

This is not testing the assignment operator.

[fschneider, 2010/03/09 09:51:53]

Done.

+    CHECK(w.Contains(0));
+    w.Add(1);
+    BitVector u(w);
+    CHECK(u.Contains(0));
+    CHECK(u.Contains(1));
+    v.Union(w);
+    CHECK(v.Contains(0));
+    CHECK(v.Contains(1));
+  }
+
+  {
     BitVector v(35);
     v.Add(0);
     BitVector w(35);