Put functions used in compile-time constants in the worklist of codegen.

lib/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.
 
 /**
  * The [ConstantHandler] keeps track of compile-time constants,
  * initializations of global and static fields, and default values of
  * optional parameters.
  */
 class ConstantHandler extends CompilerTask {
@@ skipping 387 matching lines @@
           result = compiler.compileVariable(element);
         }
       }
       if (result == null) return signalNotCompileTimeConstant(send);
       return result;
     } else if (Elements.isStaticOrTopLevelFunction(element)
                && send.isPropertyAccess) {
       compiler.codegenWorld.staticFunctionsNeedingGetter.add(element);
       Constant constant = new FunctionConstant(element);
       compiler.constantHandler.registerCompileTimeConstant(constant);
+      compiler.enqueuer.codegen.registerStaticUse(element);
       return constant;
     } else if (send.isPrefix) {
       assert(send.isOperator);
       Constant receiverConstant = evaluate(send.receiver);
       if (receiverConstant == null) return null;
       Operator op = send.selector;
       Constant folded;
       switch (op.source.stringValue) {
         case "!":
           folded = constantSystem.not.fold(receiverConstant);
@@ skipping 359 matching lines @@
       Constant fieldValue = fieldValues[field];
       if (fieldValue === null) {
         // Use the default value.
         fieldValue = compiler.compileConstant(field);
       }
       jsNewArguments.add(fieldValue);
     });
     return jsNewArguments;
   }
 }