DDC: mostly incremental compilation, fixes #223

lib/runtime/dart/core.txt

Index: lib/runtime/dart/core.txt
diff --git a/lib/runtime/dart/core.txt b/lib/runtime/dart/core.txt
new file mode 100644
index 0000000000000000000000000000000000000000..7bba0443fc1c7cb657f0ae255f8813858584efc6
--- /dev/null
+++ b/lib/runtime/dart/core.txt
@@ -0,0 +1,15 @@
+warning: [DownCastComposite] (generator != null) ? generator : _id (Function) will need runtime check to cast to type (int) → E (dart:core/iterable.dart, line 319, col 22)
+warning: [DownCastComposite] e (dynamic) will need runtime check to cast to type E (dart:core/list.dart, line 121, col 16)
+warning: [DownCastComposite] makeListFixedLength(list) (List<dynamic>) will need runtime check to cast to type List<E> (dart:core/list.dart, line 124, col 12)
+warning: [DownCastComposite] _userinfoTable (List<dynamic>) will need runtime check to cast to type List<int> (dart:core/uri.dart, line 1131, col 45)
+warning: [DownCastComposite] _pathCharOrSlashTable (List<dynamic>) will need runtime check to cast to type List<int> (dart:core/uri.dart, line 1144, col 45)
+warning: [DownCastComposite] _pathCharTable (List<dynamic>) will need runtime check to cast to type List<int> (dart:core/uri.dart, line 1146, col 51)
+warning: [DownCastComposite] _queryCharTable (List<dynamic>) will need runtime check to cast to type List<int> (dart:core/uri.dart, line 1163, col 61)
+warning: [DownCastComposite] _queryCharTable (List<dynamic>) will need runtime check to cast to type List<int> (dart:core/uri.dart, line 1183, col 45)
+warning: [DownCastComposite] codeUnits (List<dynamic>) will need runtime check to cast to type Iterable<int> (dart:core/uri.dart, line 1278, col 37)
+warning: [DownCastComposite] _unreserved2396Table (List<dynamic>) will need runtime check to cast to type List<int> (dart:core/uri.dart, line 1754, col 23)
+warning: [DownCastComposite] _unreservedTable (List<dynamic>) will need runtime check to cast to type List<int> (dart:core/uri.dart, line 1793, col 9)
+warning: [DownCastComposite] _encodeFullTable (List<dynamic>) will need runtime check to cast to type List<int> (dart:core/uri.dart, line 1837, col 23)
+warning: [DownCastComposite] query.split("&").fold({}, (map, element) {int index = element.indexOf("="); if (index == -1) {if (element != "") {map[decodeQueryComponent(element, encoding: encoding)] = "";}} else if (index != 0) {var key = element.substring(0, index); var value = element.substring(index + 1); map[Uri.decodeQueryComponent(key, encoding: encoding)] = decodeQueryComponent(value, encoding: encoding);} return map;}) (dynamic) will need runtime check to cast to type Map<String, String> (dart:core/uri.dart, line 1869, col 12)
+warning: [DownCastComposite] bytes.map((byteString) {int byte = int.parse(byteString); if (byte < 0 || byte > 255) {error('each part must be in the range of `0..255`');} return byte;}).toList() (List<dynamic>) will need runtime check to cast to type List<int> (dart:core/uri.dart, line 1901, col 12)
+warning: [DownCastComposite] bytes (List<dynamic>) will need runtime check to cast to type List<int> (dart:core/uri.dart, line 2023, col 12)