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

tests/kernel/unsorted/finally_contexts_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 'expect.dart';
+
+// Test that the context depth is correct in the presence of control flow,
+// specifically branching and joining in the presence of break.  The
+// implementation uses the context depth after the else block of an if/then/else
+// as the context depth at the join point.  This test has an extra context
+// allocated in the (untaken) else branch so it tests that compiling the
+// (untaken) break properly tracks the context depth.
+
+test(list) {
+  // The loops force creation of a new context, otherwise context allocated
+  // variables might be hoisted to an outer context.
+  do {
+    if (list.length > 1) {
+      do {
+        var sum = 0;
+        addem() {
+          for (var x in list) sum += x;
+        }
+        addem();
+        Expect.isTrue(sum == 15);
+        L: if (sum != 15) {
+          // Unreachable.
+          do {
+            var product = 1;
+            multiplyem() {
+              for (var x in list) product *= x;
+            }
+            multiplyem();
+            Expect.isTrue(false);
+            break L;
+          } while (false);
+        }
+      } while (false);
+    }
+  } while (false);
+  Expect.isTrue(list.length == 5);
+}
+
+
+main() {
+  test([1, 2, 3, 4, 5]);
+}