Move UICommon/Disassembler to Common/HostDisassembler

A preliminary commit for a cleaner diff and an easier review

Source/Core/Common/HostDisassembler.h

@@ -0,0 +1,30 @@
+// Copyright 2008 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <memory>
+#include <string>
+#include "Common/CommonTypes.h"
+
+class HostDisassembler
+{
+public:
+  virtual ~HostDisassembler() {}
+  virtual std::string DisassembleHostBlock(const u8* code_start, const u32 code_size,
+                                           u32* host_instructions_count, u64 starting_pc)
+  {
+    return "(No disassembler)";
+  }
+};
+
+struct DisassembleResult
+{
+  std::string text;
+  u32 entry_address = 0;
+  u32 instruction_count = 0;
+  u32 code_size = 0;
+};
+
+std::unique_ptr<HostDisassembler> GetNewDisassembler(const std::string& arch);
+DisassembleResult DisassembleBlock(HostDisassembler* disasm, u32 address);