Fix JS minifier to lift var declarations within functions. Still disabled.

tests/compiler/dart2js/type_inference3_test.dart

Index: tests/compiler/dart2js/type_inference3_test.dart
diff --git a/tests/compiler/dart2js/type_inference3_test.dart b/tests/compiler/dart2js/type_inference3_test.dart
index 70fabe8f5e2163235ad5a95829397d0654b202da..65e91476b6b0518ac10815cc761f35d63b0b90a0 100644
--- a/tests/compiler/dart2js/type_inference3_test.dart
+++ b/tests/compiler/dart2js/type_inference3_test.dart
@@ -14,8 +14,8 @@ sum(param0, param1) {
 
 main() {
   String generated = compile(TEST_ONE, 'sum');
-  RegExp regexp = new RegExp(getNumberTypeCheck('param0'));
+  RegExp regexp = new RegExp(getNumberTypeCheck('(param0|a)'));
   Expect.isTrue(regexp.hasMatch(generated));
-  regexp = new RegExp(getNumberTypeCheck('param1'));
+  regexp = new RegExp(getNumberTypeCheck('(param1|b)'));
   Expect.isTrue(regexp.hasMatch(generated));
 }