dart2js: Recanonicalize selectors in static fields between runs.

pkg/compiler/lib/src/compiler.dart

Index: pkg/compiler/lib/src/compiler.dart
diff --git a/pkg/compiler/lib/src/compiler.dart b/pkg/compiler/lib/src/compiler.dart
index cd983fe414f486fc6b376cbc1186bc2e6eae2b71..392b2026b6fc8cbf6e8d66de3db1a9ca40e7f80d 100644
--- a/pkg/compiler/lib/src/compiler.dart
+++ b/pkg/compiler/lib/src/compiler.dart
@@ -84,6 +84,8 @@ import 'library_loader.dart' show
     LoadedLibraries;
 import 'mirrors_used.dart' show
     MirrorUsageAnalyzerTask;
+import 'common/names.dart' show
+    Selectors;
 import 'null_compiler_output.dart' show
     NullCompilerOutput,
     NullSink;
@@ -842,6 +844,13 @@ abstract class Compiler {
     StringToken.canonicalizedSubstrings.clear();
     Selector.canonicalizedValues.clear();
 
+    // The selector objects held in static fields must remain canonical.
+    for (Selector selector in Selectors.ALL) {
+      Selector.canonicalizedValues
+        .putIfAbsent(selector.hashCode, () => <Selector>[])
+        .add(selector);
+    }
+
     assert(uri != null || analyzeOnly || hasIncrementalSupport);
     return new Future.sync(() {
       if (librariesToAnalyzeWhenRun != null) {
@@ -2065,4 +2074,4 @@ class GlobalDependencyRegistry extends EagerRegistry {
   Iterable<Element> get otherDependencies {
     return _otherDependencies != null ? _otherDependencies : const <Element>[];
   }
-}
+}