Refactor SideEffects struct

test/libyul/functionSideEffects/cyclic_graph.yul

@@ -4,7 +4,7 @@
     function c() { b() }
 }
 // ----
-// : movable, sideEffectFree, sideEffectFreeIfNoMSize
-// a:
-// b:
-// c:
+// : movable, movable apart from effects, can be removed, can be removed if no msize
+// a: movable apart from effects, can loop
+// b: movable apart from effects, can loop
+// c: movable apart from effects, can loop