Suppress memcpy writing to an object with no trivial copy-assignment warnings

We need to copy padding in most of these cases, and the objects are trivially copyable; however, BitField prevents trivial copy-assignment.

Source/Core/Core/FifoPlayer/FifoPlayer.cpp

@@ -101,7 +101,14 @@ void FifoPlaybackAnalyzer::AnalyzeFrames(FifoDataFile* file,
         part_start = offset;
         // Copy cpmem now, because end_of_primitives isn't triggered until the first opcode after
         // primitive data, and the first opcode might update cpmem
+#ifdef __GNUC__
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wclass-memaccess"
+#endif
         std::memcpy(&cpmem, &analyzer.m_cpmem, sizeof(CPState));
+#ifdef __GNUC__
+#pragma GCC diagnostic pop
+#endif
       }
       if (analyzer.m_end_of_primitives)
       {

Source/Core/Core/HW/MemoryInterface.cpp

@@ -150,7 +150,14 @@ void Init()
 {
   auto& state = Core::System::GetInstance().GetMemoryInterfaceState().GetData();
   static_assert(std::is_trivially_copyable_v<MIMemStruct>);
+#ifdef __GNUC__
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wclass-memaccess"
+#endif
   std::memset(&state.mi_mem, 0, sizeof(MIMemStruct));
+#ifdef __GNUC__
+#pragma GCC diagnostic pop
+#endif
 }
 
 void Shutdown()

Source/Core/Core/HW/WiimoteEmu/DesiredWiimoteState.cpp

@@ -136,7 +136,14 @@ static bool DeserializeExtensionState(DesiredWiimoteState* state,
     return false;
   auto& e = state->extension.data.emplace<T>();
   static_assert(std::is_trivially_copyable_v<T>);
+#ifdef __GNUC__
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wclass-memaccess"
+#endif
   std::memcpy(&e, &serialized.data[offset], sizeof(T));
+#ifdef __GNUC__
+#pragma GCC diagnostic pop
+#endif
   return true;
 }