Support encoding of NaN, infinity and negative infinity.

tests/compiler/dart2js/serialization/test_data.dart

Index: tests/compiler/dart2js/serialization/test_data.dart
diff --git a/tests/compiler/dart2js/serialization/test_data.dart b/tests/compiler/dart2js/serialization/test_data.dart
index 73d088fd0d5cb069d81b357be0816b1ea1e8afcd..065bf660d0d43675dbb7669e179d9f3204a7fa91 100644
--- a/tests/compiler/dart2js/serialization/test_data.dart
+++ b/tests/compiler/dart2js/serialization/test_data.dart
@@ -685,6 +685,14 @@ main() => y;
 var x, y = 2;
 ''',
   }),
+
+  const Test('Double values', const {},
+      preserializedSourceFiles: const {
+  'main.dart': '''
+const a = 1e+400;
+main() => a;
+''',
+  }),
 ];
 
 class Test {