Simplify expression for inner product fallback in Gemv product evaluator.

Eigen/src/Core/ProductEvaluators.h

diff --git a/Eigen/src/Core/ProductEvaluators.h b/Eigen/src/Core/ProductEvaluators.h
index 6b32c50..6e220d7 100644
--- a/Eigen/src/Core/ProductEvaluators.h
+++ b/Eigen/src/Core/ProductEvaluators.h
@@ -377,7 +377,7 @@
   {
     // Fallback to inner product if both the lhs and rhs is a runtime vector.
     if (lhs.rows() == 1 && rhs.cols() == 1) {
-      dst.coeffRef(0,0) += alpha * (lhs.row(0).transpose().cwiseProduct(rhs.col(0)).sum());
+      dst.coeffRef(0,0) += alpha * lhs.row(0).conjugate().dot(rhs.col(0));
       return;
     } 
     LhsNested actual_lhs(lhs);