Hook up the --minify option in dart2js and use it to get rid of unnecessary whitespace inside funct…

lib/compiler/implementation/ssa/codegen.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.
 
 class SsaCodeGeneratorTask extends CompilerTask {
 
   final JavaScriptBackend backend;
 
   SsaCodeGeneratorTask(JavaScriptBackend backend)
       : this.backend = backend,
@@ skipping 60 matching lines @@
             compiler, buffer, element, codeString, parametersString);
         js.Node nativeCode = new js.LiteralStatement(buffer.toString());
         body = new js.Block(<js.Statement>[nativeCode]);
       } else {
         body = codegen.body;
       }
       js.Fun fun = buildJavaScriptFunction(element, parameters, body);
       return prettyPrint(fun, work.element);
     });
   }
-  
+
   void addTypeParameters(Element element,
                         List<js.Parameter> parameters,
                         Map<Element, String> parameterNames) {
     if (element.isFactoryConstructor() || element.isGenerativeConstructor()) {
       ClassElement cls = element.enclosingElement;
       cls.typeVariables.forEach((TypeVariableType typeVariable) {
         String name = typeVariable.element.name.slowToString();
         String prefix = '';
         // Avoid collisions with real parameters of the method.
-        do {  
+        do {
           name = JsNames.getValid('$prefix$name');
           prefix = '\$$prefix';
         } while (parameterNames.containsValue(name));
         parameterNames[typeVariable.element] = name;
         parameters.add(new js.Parameter(name));
       });
     }
   }
 
   CodeBuffer generateBailoutMethod(WorkItem work, HGraph graph) {
@@ skipping 2823 matching lines @@
   if (leftType.canBeNull() && rightType.canBeNull()) {
     if (left.isConstantNull() || right.isConstantNull() ||
         (leftType.isPrimitive() && leftType == rightType)) {
       return '==';
     }
     return null;
   } else {
     return '===';
   }
 }