CPU: Basic recompiler implementation for x64 (lui, ori, addiu)

Disabled by default.

src/core/cpu_recompiler_thunks.h

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+#pragma once
+#include "common/jit_code_buffer.h"
+#include "cpu_core.h"
+#include <array>
+
+namespace CPU::Recompiler {
+
+class Thunks
+{
+public:
+  //////////////////////////////////////////////////////////////////////////
+  // Trampolines for calling back from the JIT
+  // Needed because we can't cast member functions to void*...
+  // TODO: Abuse carry flag or something else for exception
+  //////////////////////////////////////////////////////////////////////////
+  static bool ReadMemoryByte(Core* cpu, u32 address, u8* value);
+  static bool ReadMemoryHalfWord(Core* cpu, u32 address, u16* value);
+  static bool ReadMemoryWord(Core* cpu, u32 address, u32* value);
+  static bool WriteMemoryByte(Core* cpu, u32 address, u8 value);
+  static bool WriteMemoryHalfWord(Core* cpu, u32 address, u16 value);
+  static bool WriteMemoryWord(Core* cpu, u32 address, u32 value);
+  static bool InterpretInstruction(Core* cpu);
+};
+
+class ASMFunctions
+{
+public:
+  bool (*read_memory_byte)(u32 address, u8* value);
+  bool (*read_memory_word)(u32 address, u16* value);
+  bool (*read_memory_dword)(u32 address, u32* value);
+  void (*write_memory_byte)(u32 address, u8 value);
+  void (*write_memory_word)(u32 address, u16 value);
+  void (*write_memory_dword)(u32 address, u32 value);
+
+  void Generate(JitCodeBuffer* code_buffer);
+};
+
+} // namespace CPU_X86::Recompiler