Make string juxtaposition combine properly with string interpolations.

frog/leg/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 {
   SsaCodeGeneratorTask(Compiler compiler) : super(compiler);
   String get name() => 'SSA code generator';
 
   String generate(WorkItem work, HGraph graph) {
     return measure(() {
@@ skipping 126 matching lines @@
   abstract startThen(HIf node);
   abstract endThen(HIf node);
   abstract startElse(HIf node);
   abstract endElse(HIf node);
 
   void beginExpression(int precedence) {
     if (precedence < expectedPrecedence) {
       buffer.add('(');
     }
   }
+
   void endExpression(int precedence) {
     if (precedence < expectedPrecedence) {
       buffer.add(')');
     }
   }
 
   visitGraph(HGraph graph) {
     currentGraph = graph;
     indent++;  // We are already inside a function.
     subGraph = new SubGraph(graph.entry, graph.exit);
@@ skipping 1274 matching lines @@
       startBailoutSwitch();
     }
   }
 
   void endElse(HIf node) {
     if (node.elseBlock.hasBailouts()) {
       endBailoutSwitch();
     }
   }
 }