Explicit align

Author: WeiqunZhang

Src/Particle/AMReX_Particle.H

@@ -290,9 +290,8 @@ struct SoAParticleBase
  * \tparam T_NInt The number of extra integer components
  */
 template <int T_NReal, int T_NInt=0>
-struct alignas(sizeof(ParticleReal))
-       alignas(ParticleBase<ParticleReal,T_NReal,T_NInt>)
-Particle :     ParticleBase<ParticleReal,T_NReal,T_NInt>
+struct alignas(sizeof(double)) Particle
+    : ParticleBase<ParticleReal,T_NReal,T_NInt>
 {
     static constexpr bool is_soa_particle = false;
     using StorageParticleType = Particle;