Implement MirrorUsed.targets for libraries

dart/sdk/lib/_internal/compiler/implementation/resolution/members.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 resolution;
 
 abstract class TreeElements {
   Element get currentElement;
   Set<Node> get superUses;
 
@@ skipping 2199 matching lines @@
       }
     }
   }
 
   visitSend(Send node) {
     bool oldSendIsMemberAccess = sendIsMemberAccess;
     sendIsMemberAccess = node.isPropertyAccess || node.isCall;
     Element target = resolveSend(node);
     sendIsMemberAccess = oldSendIsMemberAccess;
 
-    if (target != null && target == compiler.mirrorSystemGetNameFunction) {
+    if (target != null
+        && target == compiler.mirrorSystemGetNameFunction
+        && !compiler.mirrorUsageAnalyzerTask.hasMirrorUsage(enclosingElement)) {
       compiler.reportHint(
           node.selector, MessageKind.STATIC_FUNCTION_BLOAT,
           {'class': compiler.mirrorSystemClass.name,
            'name': compiler.mirrorSystemGetNameFunction.name});
     }
 
     if (!Elements.isUnresolved(target)) {
       if (target.isAbstractField()) {
         AbstractFieldElement field = target;
         target = field.getter;
@@ skipping 397 matching lines @@
           compiler.reportError(argumentNode, MessageKind.STRING_EXPECTED,
                                    {'type': type});
         } else {
           StringConstant stringConstant = name;
           String nameString = stringConstant.toDartString().slowToString();
           if (validateSymbol(argumentNode, nameString)) {
             world.registerConstSymbol(nameString, mapping);
           }
         }
       } else {
-        compiler.reportHint(
-            node.newToken, MessageKind.NON_CONST_BLOAT,
-            {'name': compiler.symbolClass.name});
+        if (!compiler.mirrorUsageAnalyzerTask.hasMirrorUsage(
+                enclosingElement)) {
+          compiler.reportHint(
+              node.newToken, MessageKind.NON_CONST_BLOAT,
+              {'name': compiler.symbolClass.name});
+        }
         world.registerNewSymbol(mapping);
       }
     }
 
     return null;
   }
 
   bool validateSymbol(Node node, String name) {
     if (name.isEmpty) return true;
     if (name.startsWith('_')) {
@@ skipping 1412 matching lines @@
     return e;
   }
 
   /// Assumed to be called by [resolveRedirectingFactory].
   Element visitReturn(Return node) {
     Node expression = node.expression;
     return finishConstructorReference(visit(expression),
                                       expression, expression);
   }
 }