Update co19 status files and some small fixes.

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

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of dart2js;
 
 const DART_CONSTANT_SYSTEM = const DartConstantSystem();
 
 class BitNotOperation implements UnaryOperation {
   final SourceString name = const SourceString('~');
@@ skipping 189 matching lines @@
   apply(left, right) => left % right;
 }
 
 class TruncatingDivideOperation extends ArithmeticNumOperation {
   final SourceString name = const SourceString('~/');
   const TruncatingDivideOperation();
   int foldInts(int left, int right) {
     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;
 }
 
 class DivideOperation extends ArithmeticNumOperation {
   final SourceString name = const SourceString('/');
   const DivideOperation();
   num foldNums(num left, num right) => left / right;
   bool isDivide() => true;
   apply(left, right) => left / right;
 }
@@ skipping 143 matching lines @@
   bool isInt(Constant constant) => constant.isInt();
   bool isDouble(Constant constant) => constant.isDouble();
   bool isString(Constant constant) => constant.isString();
   bool isBool(Constant constant) => constant.isBool();
   bool isNull(Constant constant) => constant.isNull();
 
   bool isSubtype(Compiler compiler, DartType s, DartType t) {
     return compiler.types.isSubtype(s, t);
   }
 }