Handle double literals in constant constructors.

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 44420f3935978ad36ce6785533922c1e5b6b75d9..6dfa0955e80f85ede5e2c807c8acd326a48cc1f9 100644
--- a/tests/compiler/dart2js/serialization/test_data.dart
+++ b/tests/compiler/dart2js/serialization/test_data.dart
@@ -437,6 +437,23 @@ class C {
 }
 ''',
   }),
+
+  const Test('Double literal in constant constructor', const {
+    'main.dart': '''
+import 'a.dart';
+
+main() {
+  const A(1.0);
+}
+''',
+  }, preserializedSourceFiles: const {
+    'a.dart': '''
+class A {
+  final field1;
+  const A(a) : this.field1 = a + 1.0;
+}
+''',
+  }),
 ];
 
 class Test {