Fix eigen build (#56774)

* Fix eigen build

* Fix

* Fix

patches/eigen/Complex.h.patch

-diff --git a/Eigen/src/Core/arch/SSE/Complex.h b/Eigen/src/Core/arch/SSE/Complex.h
-index f6f1b8c..2f4e7d1 100644
---- a/Eigen/src/Core/arch/SSE/Complex.h
-+++ b/Eigen/src/Core/arch/SSE/Complex.h
+diff --git a/old/Complex.h b/new/Complex.h
+index f6f1b8c..7558e8c 100644
+--- a/old/Complex.h
++++ b/new/Complex.h
 @@ -17,7 +17,7 @@ namespace internal {
  //---------- float ----------
  struct Packet2cf
@@ -11,3 +11,28 @@ index f6f1b8c..2f4e7d1 100644
    EIGEN_STRONG_INLINE explicit Packet2cf(const __m128& a) : v(a) {}
    __m128  v;
  };
+@@ -113,19 +113,13 @@ template<> EIGEN_STRONG_INLINE Packet2cf ploadu<Packet2cf>(const std::complex<fl
+ template<> EIGEN_STRONG_INLINE Packet2cf pset1<Packet2cf>(const std::complex<float>&  from)
+ {
+   Packet2cf res;
+-#if EIGEN_GNUC_AT_MOST(4,2)
+-  // Workaround annoying "may be used uninitialized in this function" warning with gcc 4.2
+-  res.v = _mm_loadl_pi(_mm_set1_ps(0.0f), reinterpret_cast<const __m64*>(&from));
+-#elif EIGEN_GNUC_AT_LEAST(4,6)
+-  // Suppress annoying "may be used uninitialized in this function" warning with gcc >= 4.6
+-  #pragma GCC diagnostic push
+-  #pragma GCC diagnostic ignored "-Wuninitialized"
+-  res.v = _mm_loadl_pi(res.v, (const __m64*)&from);
+-  #pragma GCC diagnostic pop
++#ifdef EIGEN_VECTORIZE_SSE3
++  res.v = _mm_castpd_ps(_mm_loaddup_pd(reinterpret_cast<double const*>(&from)));
+ #else
+-  res.v = _mm_loadl_pi(res.v, (const __m64*)&from);
++  res.v = _mm_castpd_ps(_mm_load_sd(reinterpret_cast<double const*>(&from)));
++  res.v = _mm_movelh_ps(res.v, res.v);
+ #endif
+-  return Packet2cf(_mm_movelh_ps(res.v,res.v));
++  return res;
+ }
+ 
+ template<> EIGEN_STRONG_INLINE Packet2cf ploaddup<Packet2cf>(const std::complex<float>* from) { return pset1<Packet2cf>(*from); }