Update Eigen to commit:b396a6fbb2e173f52edb3360485dedf3389ef830 CHANGELOG ========= b396a6fbb - Add free-function swap. 820e8a45f - add compile time info to reverse in place b55dab7f2 - Fix DenseBase::tail for Dynamic template argument e0cbc55d9 - Update README.md PiperOrigin-RevId: 686151157 Change-Id: Ib5c5a685c6277a21aa6fd75f5468de4c42461ddd