Generate less code when importing dart:mirrors.

dart/sdk/lib/_internal/compiler/implementation/compile_time_constants.dart

 // Copyright (c) 2012, 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;
 
 /**
  * The [ConstantHandler] keeps track of compile-time constants,
  * initializations of global and static fields, and default values of
  * optional parameters.
@@ skipping 38 matching lines @@
       registerGetOfStaticFunction(function.element);
     } else if (constant.isInterceptor()) {
       // An interceptor constant references the class's prototype chain.
       InterceptorConstant interceptor = constant;
       registerInstantiatedClass(interceptor.dispatchedType.element, elements);
     }
     compiledConstants.add(constant);
   }
 
   void registerInstantiatedClass(ClassElement element, TreeElements elements) {
-    if (isMetadata) return;
+    if (isMetadata) {
+      compiler.backend.registerMetadataInstantiatedClass(element, elements);
+      return;
+    }
     compiler.enqueuer.codegen.registerInstantiatedClass(element, elements);
   }
 
   void registerStaticUse(Element element) {
-    if (isMetadata) return;
+    if (isMetadata) {
+      compiler.backend.registerMetadataStaticUse(element);
+      return;
+    }
     compiler.analyzeElement(element.declaration);
     compiler.enqueuer.codegen.registerStaticUse(element);
   }
 
   void registerGetOfStaticFunction(FunctionElement element) {
-    if (isMetadata) return;
+    if (isMetadata) {
+      compiler.backend.registerMetadataGetOfStaticFunction(element);
+      return;
+    }
     compiler.analyzeElement(element.declaration);
     compiler.enqueuer.codegen.registerGetOfStaticFunction(element);
   }
 
   void registerStringInstance(TreeElements elements) {
     registerInstantiatedClass(compiler.stringClass, elements);
   }
 
   void registerCreateRuntimeTypeFunction() {
     if (createRuntimeTypeFunction != null) return;
@@ skipping 356 matching lines @@
       StringConstant partString = evaluate(part.string);
       if (partString == null) return null;
       accumulator = new DartString.concat(accumulator, partString.value);
     };
     handler.registerStringInstance(elements);
     return constantSystem.createString(accumulator, node);
   }
 
   Constant makeTypeConstant(Element element) {
     DartType elementType = element.computeType(compiler).asRaw();
-    if (compiler.mirrorsEnabled) {
-      handler.registerInstantiatedClass(element, elements);
-    }
+    compiler.backend.registerTypeLiteral(element, elements);
     DartType constantType =
         compiler.backend.typeImplementation.computeType(compiler);
     Constant constant = new TypeConstant(elementType, constantType);
     // If we use a type literal in a constant, the compile time
     // constant emitter will generate a call to the createRuntimeType
     // helper so we register a use of that.
     handler.registerCreateRuntimeTypeFunction();
     handler.registerCompileTimeConstant(constant, elements);
     return constant;
   }
@@ skipping 430 matching lines @@
           if (fieldValue == null) {
             // Use the default value.
             fieldValue = handler.compileConstant(field);
           }
           jsNewArguments.add(fieldValue);
         },
         includeSuperAndInjectedMembers: true);
     return jsNewArguments;
   }
 }