Fixed bug #647 by using smart_copy instead of bitwise memcpy.

Eigen/src/SparseCore/CompressedStorage.h

diff --git a/Eigen/src/SparseCore/CompressedStorage.h b/Eigen/src/SparseCore/CompressedStorage.h
index 3321fab..10d516a 100644
--- a/Eigen/src/SparseCore/CompressedStorage.h
+++ b/Eigen/src/SparseCore/CompressedStorage.h
@@ -51,8 +51,8 @@
     CompressedStorage& operator=(const CompressedStorage& other)
     {
       resize(other.size());
-      memcpy(m_values, other.m_values, m_size * sizeof(Scalar));
-      memcpy(m_indices, other.m_indices, m_size * sizeof(Index));
+      internal::smart_copy(other.m_values,  other.m_values  + m_size, m_values);
+      internal::smart_copy(other.m_indices, other.m_indices + m_size, m_indices);
       return *this;
     }