Set up a stub pipline for using the new cps-based ir to generate js.

pkg/compiler/lib/src/ssa/builder.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 ssa;
 
+class SsaFunctionCompiler implements FunctionCompiler {
+  SsaCodeGeneratorTask generator;
+  SsaBuilderTask builder;
+  SsaOptimizerTask optimizer;
+
+  SsaFunctionCompiler(JavaScriptBackend backend)
+      : generator = new SsaCodeGeneratorTask(backend),
+        builder = new SsaBuilderTask(backend),
+        optimizer = new SsaOptimizerTask(backend);
+
+  /// Generates JavaScript code for `work.element`.
+  /// Using the ssa builder, optimizer and codegenerator.
+  js.Fun compile(CodegenWorkItem work) {
+    HGraph graph = builder.build(work);
+    optimizer.optimize(work, graph);
+    return generator.generateCode(work, graph);
+  }
+
+  Iterable<CompilerTask> get tasks {
+    return <CompilerTask>[builder, optimizer, generator];
+  }
+}
+
 /// A synthetic local variable only used with the SSA graph.
 ///
 /// For instance used for holding return value of function or the exception of a
 /// try-catch statement.
 class SyntheticLocal extends Local {
   final String name;
   final ExecutableElement executableContext;
 
   SyntheticLocal(this.name, this.executableContext);
 }
@@ skipping 6552 matching lines @@
     if (unaliased is TypedefType) throw 'unable to unalias $type';
     unaliased.accept(this, builder);
   }
 
   void visitDynamicType(DynamicType type, SsaBuilder builder) {
     JavaScriptBackend backend = builder.compiler.backend;
     ClassElement cls = backend.findHelper('DynamicRuntimeType');
     builder.push(new HDynamicType(type, new TypeMask.exact(cls, classWorld)));
   }
 }