dart2dart Preproces placeholders instead of renaming them lazily,

tests/compiler/dart2js/unparser_test.dart

Index: tests/compiler/dart2js/unparser_test.dart
diff --git a/tests/compiler/dart2js/unparser_test.dart b/tests/compiler/dart2js/unparser_test.dart
index d0e39f2a9aefb4646ee9f1327fb0dd8eee536c95..9050f4080986a5963316a878e41439034ea44126 100644
--- a/tests/compiler/dart2js/unparser_test.dart
+++ b/tests/compiler/dart2js/unparser_test.dart
@@ -373,11 +373,7 @@ main() {
   mylib.topfoo();
 }
 ''';
-  var expectedResult = @'topfoo(){}p_topfoo(){var x=5;}A getA()=> null;'
-      @'main(){var a=new A(); a.foo(); var b=new p_A.fromFoo(); b.foo(); '
-          @'var GREATVAR=b.myliba; b.mylist; a=getA(); p_topfoo(); topfoo();}'
-      @'class p_A{p_A.fromFoo(){}List<p_A> mylist;num foo(){}A myliba;}'
-      @'class A{foo(){}}';
+  var expectedResult = 'topfoo(){}p_topfoo(){var x=5;}p_A getA()=> null;main(){var a=new p_A(); a.foo(); var b=new A.fromFoo(); b.foo(); var GREATVAR=b.myliba; b.mylist; a=getA(); p_topfoo(); topfoo();}class A{A.fromFoo(){}List<A> mylist;num foo(){}p_A myliba;}class p_A{foo(){}}';
   testDart2DartWithLibrary(mainSrc, librarySrc,
       (String result) { Expect.equals(expectedResult, result); });
 }