fix #1901: warning in Mode==(Upper|Lower)

Eigen/src/SparseCore/SparseSelfAdjointView.h

diff --git a/Eigen/src/SparseCore/SparseSelfAdjointView.h b/Eigen/src/SparseCore/SparseSelfAdjointView.h
index 65611b3..76117a0 100644
--- a/Eigen/src/SparseCore/SparseSelfAdjointView.h
+++ b/Eigen/src/SparseCore/SparseSelfAdjointView.h
@@ -453,7 +453,7 @@
       Index r = it.row();
       Index c = it.col();
       Index ip = perm ? perm[i] : i;
-      if(Mode==(Upper|Lower))
+      if(Mode==int(Upper|Lower))
         count[StorageOrderMatch ? jp : ip]++;
       else if(r==c)
         count[ip]++;
@@ -486,7 +486,7 @@
       StorageIndex jp = perm ? perm[j] : j;
       StorageIndex ip = perm ? perm[i] : i;
       
-      if(Mode==(Upper|Lower))
+      if(Mode==int(Upper|Lower))
       {
         Index k = count[StorageOrderMatch ? jp : ip]++;
         dest.innerIndexPtr()[k] = StorageOrderMatch ? ip : jp;