ir: add dedicated IR item for division

compiler/ir.py

@@ -229,6 +229,25 @@ class IRMul(IRAction):
         return f"MUL {', '.join(values)} -> {self.dest}"
 
 
+class IRDiv(IRAction):
+
+    @typecheck
+    def __init__(self, location: SourceLocation, dest: IRAssignable, *values: IRValue):
+        super().__init__(location, reads=list(values), writes=[dest])
+        assert all(isinstance(v, IRValue) for v in values)
+        assert len(values) == 2
+
+        self.values = values
+        self.dest = dest
+
+    def destination(self) -> IRValue:
+        return self.dest
+
+    def codegen(self) -> str:
+        values = [str(value) for value in self.values]
+        return f"DIV {', '.join(values)} -> {self.dest}"
+
+
 class IRNegation(IRAction):
 
     @typecheck