Allow the common spec types to be in a separate document

pkg/analyzer_plugin/tool/spec/codegen_matchers.dart

Index: pkg/analyzer_plugin/tool/spec/codegen_matchers.dart
diff --git a/pkg/analyzer_plugin/tool/spec/codegen_matchers.dart b/pkg/analyzer_plugin/tool/spec/codegen_matchers.dart
index e54c7e215ea6ecb3e6780fee4c86321e221cc79f..bc52c0fa7a360398e3d35ec1af4525f729171473 100644
--- a/pkg/analyzer_plugin/tool/spec/codegen_matchers.dart
+++ b/pkg/analyzer_plugin/tool/spec/codegen_matchers.dart
@@ -106,7 +106,10 @@ class CodegenMatchersVisitor extends HierarchicalApiVisitor with CodeGenerator {
     writeln();
     writeln("import 'integration_tests.dart';");
     writeln();
-    for (ImpliedType impliedType in computeImpliedTypes(api).values) {
+    List<ImpliedType> impliedTypes = computeImpliedTypes(api).values.toList();
+    impliedTypes.sort((ImpliedType first, ImpliedType second) =>
+        first.camelName.compareTo(second.camelName));
+    for (ImpliedType impliedType in impliedTypes) {
       makeMatcher(impliedType);
     }
   }