Update co19 status files and some small fixes.

sdk/lib/_internal/compiler/implementation/constant_system_dart.dart

Index: sdk/lib/_internal/compiler/implementation/constant_system_dart.dart
diff --git a/sdk/lib/_internal/compiler/implementation/constant_system_dart.dart b/sdk/lib/_internal/compiler/implementation/constant_system_dart.dart
index 7899d177860f6cfb82b23efa703dc841735b3644..75dce33b1fe28438fd3cf1849e6d9515e91c8be1 100644
--- a/sdk/lib/_internal/compiler/implementation/constant_system_dart.dart
+++ b/sdk/lib/_internal/compiler/implementation/constant_system_dart.dart
@@ -207,7 +207,11 @@ class TruncatingDivideOperation extends ArithmeticNumOperation {
     if (right == 0) return null;
     return left ~/ right;
   }
-  num foldNums(num left, num right) => left ~/ right;
+  num foldNums(num left, num right) {
+    num ratio = left / right;
+    if (ratio.isNaN || ratio.isInfinite) return null;
+    return ratio.truncate().toInt();
+  }
   apply(left, right) => left ~/ right;
 }