Access ConstantSystem through ClosedWorld.

pkg/compiler/lib/src/native/ssa.dart

Index: pkg/compiler/lib/src/native/ssa.dart
diff --git a/pkg/compiler/lib/src/native/ssa.dart b/pkg/compiler/lib/src/native/ssa.dart
index 945995d2f63a324221619416199794c15689a7bd..a7f185fc3f107d8c752e9d6ae9a86a2166310e69 100644
--- a/pkg/compiler/lib/src/native/ssa.dart
+++ b/pkg/compiler/lib/src/native/ssa.dart
@@ -29,7 +29,8 @@ void handleSsaNative(SsaBuilder builder, Expression nativeBody) {
     HInstruction local = builder.localsHandler.readLocal(parameter);
     ConstantValue arityConstant =
         builder.constantSystem.createInt(type.computeArity());
-    HInstruction arity = builder.graph.addConstant(arityConstant, compiler);
+    HInstruction arity =
+        builder.graph.addConstant(arityConstant, builder.closedWorld);
     // TODO(ngeoffray): For static methods, we could pass a method with a
     // defined arity.
     Element helper = backend.helpers.closureConverter;