dart2js cps: Pull SetFields into field initializer arguments.

tests/compiler/dart2js/cps_ir/update_all.dart

 // ---- AUTO-GENERATED -------------------
 // This file was autogenerated by running:
 //
 //     dart path/to/up_to_date_test.dart update
 //
 // Do not edit this file by hand.
 // ---------------------------------------
 
 library tests.compiler.dart2js.cps_ir.update_all;
 
@@ skipping 78 matching lines @@
   runTest('closures_8.dart', update: true);
   runTest('closures_9.dart', update: true);
   runTest('codeUnitAt_1.dart', update: true);
   runTest('codeUnitAt_2.dart', update: true);
   runTest('constructor_1.dart', update: true);
   runTest('constructor_10.dart', update: true);
   runTest('constructor_11.dart', update: true);
   runTest('constructor_12.dart', update: true);
   runTest('constructor_13.dart', update: true);
   runTest('constructor_14.dart', update: true);
+  runTest('constructor_15.dart', update: true);
   runTest('constructor_2.dart', update: true);
   runTest('constructor_3.dart', update: true);
   runTest('constructor_4.dart', update: true);
   runTest('constructor_5.dart', update: true);
   runTest('constructor_6.dart', update: true);
   runTest('constructor_7.dart', update: true);
   runTest('constructor_8.dart', update: true);
   runTest('constructor_9.dart', update: true);
   runTest('control_flow_1.dart', update: true);
   runTest('control_flow_2.dart', update: true);
@@ skipping 27 matching lines @@
   runTest('optimize_indexers.dart', update: true);
   runTest('redundant_condition.dart', update: true);
   runTest('runtime_types_1.dart', update: true);
   runTest('runtime_types_2.dart', update: true);
   runTest('runtime_types_3.dart', update: true);
   runTest('runtime_types_4.dart', update: true);
   runTest('supercall_1.dart', update: true);
   runTest('supercall_2.dart', update: true);
   runTest('supercall_3.dart', update: true);
 }