dart2js: Clear tables during incremental compilation.

pkg/dart2js_incremental/lib/caching_compiler.dart

Index: pkg/dart2js_incremental/lib/caching_compiler.dart
diff --git a/pkg/dart2js_incremental/lib/caching_compiler.dart b/pkg/dart2js_incremental/lib/caching_compiler.dart
index 0d0a1457c064a4ecfc7694d2a6e36df2b6807eef..7a6aa6374a067b653ef6176787a061bec97fde1b 100644
--- a/pkg/dart2js_incremental/lib/caching_compiler.dart
+++ b/pkg/dart2js_incremental/lib/caching_compiler.dart
@@ -139,8 +139,6 @@ Future<Compiler> reuseCompiler(
         ..outputBuffers.clear()
         ..isolateProperties = null
         ..classesCollector = null
-        ..neededClasses.clear()
-        ..outputClassLists.clear()
         ..nativeClasses.clear()
         ..mangledFieldNames.clear()
         ..mangledGlobalFieldNames.clear()
@@ -150,7 +148,13 @@ Future<Compiler> reuseCompiler(
         ..elementDescriptors.clear();
 
     backend.emitter
-        ..outputContainsConstantList = false;
+        ..outputContainsConstantList = false
+        ..neededClasses.clear()
+        ..outputClassLists.clear()
+        ..outputConstantLists.clear()
+        ..outputStaticLists.clear()
+        ..outputStaticNonFinalFieldLists.clear()
+        ..outputLibraryLists.clear();
 
     backend
         ..preMirrorsMethodCount = 0;