Provide LINE_INFO using just UnlinkedUnit even though the full info is not available.

pkg/analyzer/lib/src/summary/package_bundle_reader.dart

 import 'dart:io' as io;
 
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/src/context/cache.dart';
 import 'package:analyzer/src/context/context.dart';
 import 'package:analyzer/src/dart/element/element.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/java_io.dart';
 import 'package:analyzer/src/generated/resolver.dart';
@@ skipping 156 matching lines @@
   void addBundle(String path, PackageBundle bundle) {
     _dataStore.addBundle(path, bundle);
   }
 
   @override
   bool compute(CacheEntry entry, ResultDescriptor result) {
     if (_sdkProvider != null && _sdkProvider.compute(entry, result)) {
       return true;
     }
     AnalysisTarget target = entry.target;
+
+    // LINE_INFO can be provided using just the UnlinkedUnit.
+    if (target is Source && result == LINE_INFO) {
+      String uriString = target.uri.toString();
+      UnlinkedUnit unlinkedUnit = _dataStore.unlinkedMap[uriString];
+      if (unlinkedUnit != null) {
+        List<int> lineStarts = unlinkedUnit.lineStarts;
+        if (lineStarts.isNotEmpty) {
+          LineInfo lineInfo = new LineInfo(lineStarts);
+          entry.setValue(result as ResultDescriptor<LineInfo>, lineInfo,
+              TargetedResult.EMPTY_LIST);
+          return true;
+        }
+      }
+      return false;
+    }
+
     // Check whether there are results for the source.
     if (!hasResultsForSource(target.librarySource ?? target.source)) {
       return false;
     }
     // Constant expressions are always resolved in summaries.
     if (result == CONSTANT_EXPRESSION_RESOLVED &&
         target is ConstantEvaluationTarget) {
       entry.setValue(
           result as ResultDescriptor<bool>, true, TargetedResult.EMPTY_LIST);
       return true;
@@ skipping 45 matching lines @@
         if (libraryUriStrings != null) {
           List<Source> librarySources = libraryUriStrings
               .map((libraryUriString) =>
                   context.sourceFactory.resolveUri(target, libraryUriString))
               .toList(growable: false);
           entry.setValue(result as ResultDescriptor<List<Source>>,
               librarySources, TargetedResult.EMPTY_LIST);
           return true;
         }
         return false;
-      } else if (result == LINE_INFO) {
-        UnlinkedUnit unlinkedUnit = _dataStore.unlinkedMap[uriString];
-        List<int> lineStarts = unlinkedUnit.lineStarts;
-        if (lineStarts.isNotEmpty) {
-          LineInfo lineInfo = new LineInfo(lineStarts);
-          entry.setValue(result as ResultDescriptor<LineInfo>, lineInfo,
-              TargetedResult.EMPTY_LIST);
-          return true;
-        }
-        return false;
       }
     } else if (target is LibrarySpecificUnit) {
       if (result == CREATED_RESOLVED_UNIT1 ||
           result == CREATED_RESOLVED_UNIT2 ||
           result == CREATED_RESOLVED_UNIT3 ||
           result == CREATED_RESOLVED_UNIT4 ||
           result == CREATED_RESOLVED_UNIT5 ||
           result == CREATED_RESOLVED_UNIT6 ||
           result == CREATED_RESOLVED_UNIT7 ||
           result == CREATED_RESOLVED_UNIT8 ||
@@ skipping 228 matching lines @@
  */
 @deprecated
 class _InSummaryFallbackSource extends FileBasedSource
     implements InSummarySource {
   @override
   final String summaryPath;
 
   _InSummaryFallbackSource(JavaFile file, Uri uri, this.summaryPath)
       : super(file, uri);
 }