Issue 26063. Index declarations in even partically analyzed units.

pkg/analyzer/tool/summary/build_sdk_summaries.dart

 import 'dart:io';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/java_io.dart';
 import 'package:analyzer/src/generated/sdk.dart';
 import 'package:analyzer/src/generated/sdk_io.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/summary/flat_buffers.dart' as fb;
@@ skipping 210 matching lines @@
     }
     LibraryElement element = context.computeLibraryElement(source);
     bundleAssembler.serializeLibraryElement(element);
     element.importedLibraries.forEach((e) => _serializeLibrary(e.source));
     element.exportedLibraries.forEach((e) => _serializeLibrary(e.source));
     // Index every unit of the library.
     for (CompilationUnitElement unitElement in element.units) {
       Source unitSource = unitElement.source;
       CompilationUnit unit =
           context.resolveCompilationUnit2(unitSource, source);
-      indexAssembler.index(unit);
+      indexAssembler.indexUnit(unit);
     }
   }
 }
 
 class _BuilderOutput {
   final List<int> sum;
   final List<int> index;
 
   _BuilderOutput(this.sum, this.index);
 
@@ skipping 12 matching lines @@
     }
   }
 }
 
 class _Output {
   final _BuilderOutput spec;
   final _BuilderOutput strong;
 
   _Output(this.spec, this.strong);
 }