fix(windows): add experimental guest red-zone protection.

Port the static instruction patcher from shadPS4.

src/loader/redZonePatcher.h

@@ -0,0 +1,39 @@
+// SPDX-FileCopyrightText: Copyright 2026 shadPS4 Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#ifndef KYTY_LOADER_RED_ZONE_PATCHER_H_
+#define KYTY_LOADER_RED_ZONE_PATCHER_H_
+
+#include "common/common.h"
+
+#include <span>
+#include <vector>
+
+namespace Loader {
+
+struct RedZonePatchResult {
+	uint64_t function_count                           = 0;
+	uint64_t instruction_count                        = 0;
+	uint64_t red_zone_function_count                  = 0;
+	uint64_t memory_instruction_count                 = 0;
+	uint64_t short_memory_instruction_count           = 0;
+	uint64_t patched_memory_instruction_count         = 0;
+	uint64_t stack_dependent_memory_instruction_count = 0;
+	uint64_t control_flow_memory_instruction_count    = 0;
+	uint64_t unrelocatable_memory_instruction_count   = 0;
+	uint64_t indirect_red_zone_function_count         = 0;
+};
+
+void RegisterRedZonePatchModule(void* module_ptr, uint64_t module_size, void* trampoline_area_ptr,
+                                uint64_t trampoline_area_size);
+void UnregisterRedZonePatchModule(void* module_ptr);
+
+RedZonePatchResult PatchRedZoneMemoryInstructions(uint64_t segment_addr, uint64_t segment_size,
+                                                  std::span<const uintptr_t> function_starts);
+
+bool DecodeEhFrameFunctionStarts(uint64_t eh_frame_header_addr, uint64_t eh_frame_header_size,
+                                 std::vector<uintptr_t>* function_starts);
+
+} // namespace Loader
+
+#endif /* KYTY_LOADER_RED_ZONE_PATCHER_H_ */