Remove redundant branch for handling dynamic vector*vector. This will be handled by the equivalent branch in the specialization for GemvProduct.

Eigen/src/Core/products/GeneralMatrixMatrix.h

diff --git a/Eigen/src/Core/products/GeneralMatrixMatrix.h b/Eigen/src/Core/products/GeneralMatrixMatrix.h
index 8cdf147..0d55bdf 100644
--- a/Eigen/src/Core/products/GeneralMatrixMatrix.h
+++ b/Eigen/src/Core/products/GeneralMatrixMatrix.h
@@ -471,12 +471,7 @@
     if(a_lhs.cols()==0 || a_lhs.rows()==0 || a_rhs.cols()==0)
       return;
 
-    if (dst.cols() == 1 && dst.rows() == 1) {
-      // Fallback to inner product if both the lhs and rhs is a runtime vector.
-      dst.coeffRef(0,0) += alpha * (a_lhs.row(0).transpose().cwiseProduct(a_rhs.col(0)).sum());
-      return;
-    }
-    else if (dst.cols() == 1)
+    if (dst.cols() == 1)
     {
       // Fallback to GEMV if either the lhs or rhs is a runtime vector
       typename Dest::ColXpr dst_vec(dst.col(0));