Add --use-new-source-info option

tests/compiler/dart2js/sourcemaps/diff_view.dart

Index: tests/compiler/dart2js/sourcemaps/diff_view.dart
diff --git a/tests/compiler/dart2js/sourcemaps/diff_view.dart b/tests/compiler/dart2js/sourcemaps/diff_view.dart
index c58a21edaddaa94eb75f99cb5963b52b54bce5c8..28e76330c31ae919377a9e607b164a9c6fb9d9c2 100644
--- a/tests/compiler/dart2js/sourcemaps/diff_view.dart
+++ b/tests/compiler/dart2js/sourcemaps/diff_view.dart
@@ -71,8 +71,9 @@ main(List<String> args) async {
   if (optionSegments.length == 1) {
     // Use default options; comparing SSA and CPS output using the new
     // source information strategy.
-    options.add([USE_NEW_SOURCE_INFO]..addAll(commonArguments));
-    options.add([USE_NEW_SOURCE_INFO, Flags.useCpsIr]..addAll(commonArguments));
+    options.add([Flags.useNewSourceInfo]..addAll(commonArguments));
+    options.add(
+        [Flags.useNewSourceInfo, Flags.useCpsIr]..addAll(commonArguments));
   } else if (optionSegments.length == 2) {
     // Use alternative options for the second output column.
     options.add(commonArguments);
@@ -459,7 +460,7 @@ Future<CodeLinesResult> computeCodeLines(
       String title = '${step.id}:${step.kind}:${step.offset}';
       if (!addSourceLocationsForNode(WITH_SOURCE_INFO, step.node, title)) {
         int offset;
-        if (options.contains(USE_NEW_SOURCE_INFO)) {
+        if (options.contains(Flags.useNewSourceInfo)) {
           offset = step.offset.subexpressionOffset;
         } else {
           offset = info.jsCodePositions[step.node].startPosition;