Reland "Merge more Kernel infrastructure from kernel_sdk SDK fork."

tests/kernel/unsorted/try_context_test.dart

+// Copyright (c) 2016, 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.
+
+import 'package:expect/expect.dart';
+
+throwValue(val) => throw val;
+
+f1() {
+  var a = 0;
+  var b = 0;
+  var c = 0;
+  var d = 0;
+  for (var i = 0; i < 10; i++) {
+    try {
+      for (var j = 0; j < 11; j++) {
+        try {
+          capture() => [i, j, a, b, c, d];
+          throwValue(j == 10 ? "${j}" : j);
+        } on num catch (e) {
+          a += j;
+          b -= e;
+        }
+      }
+    } catch (e) {
+      c++;
+      d += int.parse(e);
+    }
+  }
+  return [a, b, c, d];
+}
+
+
+f2() {
+  var a = 0;
+  var b = 0;
+  var c = 0;
+  var d = 0;
+  for (var i = 0; i < 10; i++) {
+    try {
+      for (var j = 0; j < 11; j++) {
+        try {
+          capture() => [i, j, a, b, c, d];
+          throwValue(j == 10 ? "${j}" : j);
+        } on num catch (e) {
+          a += j;
+          b -= e;
+        }
+      }
+    } catch (e) {
+      capture() => e;
+      c++;
+      d += int.parse(e);
+    }
+  }
+  return [a, b, c, d];
+}
+
+
+f3() {
+  var a = 0;
+  var b = 0;
+  var c = 0;
+  var d = 0;
+  for (var i = 0; i < 10; i++) {
+    try {
+      for (var j = 0; j < 11; j++) {
+        try {
+          capture() => [i, j, a, b, c, d];
+          throwValue(j == 10 ? "${j}" : j);
+        } on num catch (e) {
+          a += j;
+          b -= e;
+        }
+      }
+    } catch (e) {
+      capture() => e;
+      c++;
+      d += int.parse(e);
+      continue;
+    }
+  }
+  return [a, b, c, d];
+}
+
+
+main() {
+  Expect.listEquals([450, -450, 10, 100], f1());
+  Expect.listEquals([450, -450, 10, 100], f2());
+  Expect.listEquals([450, -450, 10, 100], f3());
+}