[upstream_utils] Upgrade Sleipnir (#7973)

upstream_utils/sleipnir_patches/0003-Use-wpi-byteswap.patch

@@ -0,0 +1,41 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Tyler Veness <calcmogul@gmail.com>
+Date: Tue, 28 Jan 2025 22:19:14 -0800
+Subject: [PATCH 3/8] Use wpi::byteswap()
+
+---
+ include/.styleguide           | 1 +
+ include/sleipnir/util/spy.hpp | 3 ++-
+ 2 files changed, 3 insertions(+), 1 deletion(-)
+
+diff --git a/include/.styleguide b/include/.styleguide
+index 4f4c76204071f90bf49eddb8c2aceb583b5e09ba..03938557c2600a7a1f72c6b93c935602f5acb2b2 100644
+--- a/include/.styleguide
++++ b/include/.styleguide
+@@ -10,4 +10,5 @@ includeOtherLibs {
+   ^Eigen/
+   ^fmt/
+   ^gch/
++  ^wpi/
+ }
+diff --git a/include/sleipnir/util/spy.hpp b/include/sleipnir/util/spy.hpp
+index a2f94803e3744cee771669210d1af883160e9896..8cd7d4353aad20153af5cd7a818fa55889d35721 100644
+--- a/include/sleipnir/util/spy.hpp
++++ b/include/sleipnir/util/spy.hpp
+@@ -12,6 +12,7 @@
+ #include <string_view>
+ 
+ #include <Eigen/SparseCore>
++#include <wpi/bit.h>
+ 
+ #include "sleipnir/util/symbol_exports.hpp"
+ 
+@@ -115,7 +116,7 @@ class SLEIPNIR_DLLEXPORT Spy {
+    */
+   void write32le(int32_t num) {
+     if constexpr (std::endian::native != std::endian::little) {
+-      num = std::byteswap(num);
++      num = wpi::byteswap(num);
+     }
+     m_file.write(reinterpret_cast<char*>(&num), sizeof(num));
+   }