Build new IR for functions returning a constant

sdk/lib/_internal/compiler/implementation/ssa/ssa.dart

Index: sdk/lib/_internal/compiler/implementation/ssa/ssa.dart
diff --git a/sdk/lib/_internal/compiler/implementation/ssa/ssa.dart b/sdk/lib/_internal/compiler/implementation/ssa/ssa.dart
index 5b0cc172db1ad8d21e021c72d0dad504d4ae3528..64c9200d9e28b3179a7b86a6fc78a79d3fba7ba4 100644
--- a/sdk/lib/_internal/compiler/implementation/ssa/ssa.dart
+++ b/sdk/lib/_internal/compiler/implementation/ssa/ssa.dart
@@ -16,6 +16,7 @@ import '../elements/elements.dart';
 import '../js_backend/js_backend.dart';
 import '../native_handler.dart' as native;
 import '../tree/tree.dart';
+import '../ir/ir_nodes.dart';
 import '../types/types.dart';
 import '../universe/universe.dart';
 import '../util/util.dart';
@@ -30,6 +31,8 @@ import '../elements/modelx.dart'
 import '../js_emitter/js_emitter.dart' show CodeEmitterTask;
 
 part 'builder.dart';
+part 'from_ir_builder.dart';
+part 'from_ir_inliner.dart';
 part 'codegen.dart';
 part 'codegen_helpers.dart';
 part 'interceptor_simplifier.dart';