Fix issue 10487 by adapting the type checker so it uses the dynamic type for throw expressions.

tests/language/throw_expr_test.dart

Index: tests/language/throw_expr_test.dart
diff --git a/tests/language/throw_expr_test.dart b/tests/language/throw_expr_test.dart
index f844771b727e12d4ce63ebb65a77260af81e68fe..253e7ccbf281e4c3ab74dff78ce2151b8543db78 100644
--- a/tests/language/throw_expr_test.dart
+++ b/tests/language/throw_expr_test.dart
@@ -48,6 +48,7 @@ bar(x, y) => throw "foo" "${throw x}";
 class Q {
   var qqq;
   f(x) { qqq = x; }
+  Q get nono => throw "nono";
 }
 
 void test3() {
@@ -91,8 +92,14 @@ void test3() {
   }
 }
 
+void test4() {
+  var q = new Q();
+  Expect.throws(() => q.nono, (e) => e == "nono");
+}
+
 main() {
   test1();
   test2();
   test3();
+  test4();
 }