Use stableNorm in ComplexEigenSolver.

Eigen/src/Eigenvalues/ComplexEigenSolver.h

diff --git a/Eigen/src/Eigenvalues/ComplexEigenSolver.h b/Eigen/src/Eigenvalues/ComplexEigenSolver.h
index 6efd3c1..a68996a 100644
--- a/Eigen/src/Eigenvalues/ComplexEigenSolver.h
+++ b/Eigen/src/Eigenvalues/ComplexEigenSolver.h
@@ -292,7 +292,7 @@
   m_eivec.noalias() = m_schur.matrixU() * m_matX;
   // .. and normalize the eigenvectors
   for (Index k = 0; k < n; k++) {
-    m_eivec.col(k).normalize();
+    m_eivec.col(k).stableNormalize();
   }
 }