refact: use a ICInstruction dummy interface

This allows defining another IR instruction set

Author: boriel

src/arch/interface/icinstruction.py

@@ -0,0 +1,5 @@
+from enum import StrEnum
+
+
+class ICInstruction(StrEnum):
+    pass

src/arch/interface/quad.py

@@ -7,9 +7,10 @@
 
 from dataclasses import dataclass
 
-from src.arch.z80.backend.icinstruction import ICInstruction
 from src.symbols.symbol_ import Symbol
 
+from .icinstruction import ICInstruction
+
 __all__ = ("Quad",)
 
 

src/arch/z80/backend/icinstruction.py

@@ -5,17 +5,17 @@
 # See https://www.gnu.org/licenses/agpl-3.0.html for details.
 # --------------------------------------------------------------------
 
-from enum import StrEnum
 from functools import lru_cache
 from typing import Any
 
+from src.arch.interface.icinstruction import ICInstruction as ICInstructionInterface
 from src.arch.z80.backend.exception import InvalidICError
 
 __all__ = ("ICInstruction",)
 
 
 # HINT: Do not use Enums here. They cannot be subclassed
-class ICInstruction(StrEnum):
+class ICInstruction(ICInstructionInterface):
     ADDU8 = "addu8"
     ADDI8 = "addi8"
     ADDI16 = "addi16"