Prevent leaks from caching compiler.

dart/pkg/dart2js_incremental/lib/caching_compiler.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of dart2js_incremental;
 
 /// Do not call this method directly. It will be made private.
 // TODO(ahe): Make this method private.
 Future<Compiler> reuseCompiler(
     {DiagnosticHandler diagnosticHandler,
@@ skipping 67 matching lines @@
         ..enqueuer.resolution.queueIsClosed = false
         ..enqueuer.resolution.hasEnqueuedReflectiveElements = false
         ..enqueuer.resolution.hasEnqueuedReflectiveStaticFields = false
         ..enqueuer.codegen.queueIsClosed = false
         ..enqueuer.codegen.hasEnqueuedReflectiveElements = false
         ..enqueuer.codegen.hasEnqueuedReflectiveStaticFields = false
         ..assembledCode = null
         ..compilationFailed = false;
     JavaScriptBackend backend = compiler.backend;
 
-    backend.emitter.oldEmitter.cachedElements.addAll(
-        backend.generatedCode.keys);
+    // TODO(ahe): Seems this cache only serves to tell
+    // [OldEmitter.invalidateCaches] if it was invoked on a full compile (in
+    // which case nothing should be invalidated), or if it is an incremental
+    // compilation (in which case, holders/owners of newly compiled methods
+    // must be invalidated).
+    backend.emitter.oldEmitter.cachedElements.add(null);
 
     compiler.enqueuer.codegen.newlyEnqueuedElements.clear();
 
     backend.emitter.oldEmitter.containerBuilder
         ..staticGetters.clear();
 
     backend.emitter.oldEmitter.nsmEmitter
         ..trivialNsmHandlers.clear();
 
     backend.emitter.typeTestEmitter
@@ skipping 43 matching lines @@
             library.isPlatformLibrary ||
             (packagesAreImmutable && library.isPackageLibrary));
       };
     }
     return compiler.libraryLoader.resetAsync(reuseLibrary).then((_) {
       oldTag.makeCurrent();
       return compiler;
     });
   }
 }