Fix GPU builds.

Eigen/src/Core/util/IndexedViewHelper.h

diff --git a/Eigen/src/Core/util/IndexedViewHelper.h b/Eigen/src/Core/util/IndexedViewHelper.h
index fd8215e..abf4b19 100644
--- a/Eigen/src/Core/util/IndexedViewHelper.h
+++ b/Eigen/src/Core/util/IndexedViewHelper.h
@@ -69,7 +69,7 @@
 #else
 // Using a FixedExpr<1> expression is important here to make sure the compiler
 // can fully optimize the computation starting indices with zero overhead.
-static constexpr lastp1_t lastp1;
+static constexpr lastp1_t lastp1 = lastp1_t{};
 #endif
 
 /** \var end