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

tests/kernel/unsorted/rethrow_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';
+
+testNormalRethrow() {
+  var x = 0;
+  try {
+    try {
+      throw x++;
+    } catch (e) {
+      Expect.isTrue(e == 0);
+      x++;
+      rethrow;
+    }
+  } catch (e) {
+    Expect.isTrue(e == 0);
+    x++;
+  }
+  Expect.isTrue(x == 3);
+}
+
+testNormalRethrow2() {
+  var x = 0;
+  try {
+    try {
+      throw x++;
+    } on int catch (e) {
+      Expect.isTrue(e == 0);
+      x++;
+      rethrow;
+    }
+  } catch (e) {
+    Expect.isTrue(e == 0);
+    x++;
+  }
+  Expect.isTrue(x == 3);
+}
+
+testRethrowWithinTryRethrow() {
+  var x = 0;
+  try {
+    try {
+      throw x++;
+    } on int catch (e) {
+      Expect.isTrue(e == 0);
+      x++;
+      try {
+        x++;
+        rethrow;
+      } finally {
+        x++;
+      }
+    }
+  } catch (e) {
+    Expect.isTrue(e == 0);
+    x++;
+  }
+  Expect.isTrue(x == 5);
+}
+
+main() {
+  testNormalRethrow();
+  testNormalRethrow2();
+  testRethrowWithinTryRethrow();
+}