Revert "dart2js cps: Refactor tracking of side effects."

pkg/compiler/lib/src/cps_ir/builtin_operator.dart

Index: pkg/compiler/lib/src/cps_ir/builtin_operator.dart
diff --git a/pkg/compiler/lib/src/cps_ir/builtin_operator.dart b/pkg/compiler/lib/src/cps_ir/builtin_operator.dart
index 575164434e0b6a2084b0e34ca04b08094fa504d7..295cd3b9bfbbee008e9a062272e2e796055f26d5 100644
--- a/pkg/compiler/lib/src/cps_ir/builtin_operator.dart
+++ b/pkg/compiler/lib/src/cps_ir/builtin_operator.dart
@@ -5,8 +5,6 @@ library builtin_operator;
 // This is shared by the CPS and Tree IRs.
 // Both cps_ir_nodes and tree_ir_nodes import and re-export this file.
 
-import 'effects.dart';
-
 /// An operator supported natively in the CPS and Tree IRs using the
 /// `ApplyBuiltinOperator` instructions.
 ///
@@ -224,17 +222,3 @@ bool isCompoundableOperator(BuiltinOperator operator) {
       return false;
   }
 }
-
-int getEffectsOfBuiltinMethod(BuiltinMethod method) {
-  switch (method) {
-    case BuiltinMethod.Push:
-      return Effects.changesIndexableContent |
-             Effects.changesIndexableLength;
-    case BuiltinMethod.Pop:
-      return Effects.dependsOnIndexableContent |
-             Effects.dependsOnIndexableLength |
-             Effects.changesIndexableLength;
-    case BuiltinMethod.SetLength:
-      return Effects.changesIndexableLength;
-  }
-}