Move all flags to CompilerOptions (first step to stop passing the compiler to

pkg/compiler/lib/src/dart_backend/backend.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 dart_backend;
 
 // TODO(ahe): This class is simply wrong.  This backend should use
 // elements when it can, not AST nodes.  Perhaps a [Map<Element,
 // TreeElements>] is what is needed.
 class ElementAst {
@@ skipping 93 matching lines @@
   }
 
   DartBackend(Compiler compiler, List<String> strips, {bool multiFile})
       : tasks = <CompilerTask>[],
         stripAsserts = strips.indexOf('asserts') != -1,
         constantCompilerTask = new DartConstantTask(compiler),
         outputter = new DartOutputter(
             compiler.reporter, compiler.outputProvider,
             forceStripTypes: strips.indexOf('types') != -1,
             multiFile: multiFile,
-            enableMinification: compiler.enableMinification),
+            enableMinification: compiler.options.enableMinification),
         super(compiler) {
     impactTransformer = new DartImpactTransformer(this);
   }
 
 
   DiagnosticReporter get reporter => compiler.reporter;
 
   Resolution get resolution => compiler.resolution;
 
   bool classNeedsRti(ClassElement cls) => false;
@@ skipping 62 matching lines @@
         instantiatedClasses: compiler.resolverWorld.directlyInstantiatedClasses,
         resolvedElements: compiler.enqueuer.resolution.processedElements,
         usedTypeLiterals: usedTypeLiterals,
         postProcessElementAst: postProcessElementAst,
         computeElementAst: computeElementAst,
         shouldOutput: shouldOutput,
         isSafeToRemoveTypeDeclarations: isSafeToRemoveTypeDeclarations,
         sortElements: Elements.sortedByPosition,
         mirrorRenamer: mirrorRenamer,
         mainFunction: compiler.mainFunction,
-        outputUri: compiler.outputUri);
+        outputUri: compiler.options.outputUri);
 
     // Output verbose info about size ratio of resulting bundle to all
     // referenced non-platform sources.
     logResultBundleSizeInfo(
         outputter.libraryInfo.userLibraries,
         outputter.elementInfo.topLevelElements,
         totalSize);
 
     return totalSize;
   }
@@ skipping 339 matching lines @@
   }
 
   // TODO(johnniwinther): Remove this when values are computed from the
   // expressions.
   @override
   void copyConstantValues(DartConstantTask task) {
     constantCompiler.constantValueMap.addAll(
         task.constantCompiler.constantValueMap);
   }
 }