backend/x64: Move spill from JitState onto the stack

src/backend/x64/stack_layout.h

@@ -0,0 +1,22 @@
+/* This file is part of the dynarmic project.
+ * Copyright (c) 2016 MerryMage
+ * SPDX-License-Identifier: 0BSD
+ */
+
+#pragma once
+
+#include <array>
+
+#include "common/common_types.h"
+
+namespace Dynarmic::Backend::X64 {
+
+constexpr size_t SpillCount = 64;
+
+struct alignas(16) StackLayout {
+    std::array<std::array<u64, 2>, SpillCount> spill;
+};
+
+static_assert(sizeof(StackLayout) % 16 == 0);
+
+} // namespace Dynarmic::Backend::X64