Revert two Kernel changes that were causing test failures.

tests/language_2/assign_op_test.dart

Index: tests/language_2/assign_op_test.dart
diff --git a/tests/language_2/assign_op_test.dart b/tests/language_2/assign_op_test.dart
deleted file mode 100644
index 9ee3eae2f8365262ba1fcc1daf828356e261aa04..0000000000000000000000000000000000000000
--- a/tests/language_2/assign_op_test.dart
+++ /dev/null
@@ -1,96 +0,0 @@
-// Copyright (c) 2011, 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.
-// Dart test program for testing assign operators.
-// VMOptions=--optimization-counter-threshold=10 --no-background-compilation
-
-import "package:expect/expect.dart";
-
-class AssignOpTest {
-  AssignOpTest() {}
-
-  static testMain() {
-    var b = 0;
-    b += 1;
-    Expect.equals(1, b);
-    b *= 5;
-    Expect.equals(5, b);
-    b -= 1;
-    Expect.equals(4, b);
-    b ~/= 2;
-    Expect.equals(2, b);
-
-    f = 0;
-    f += 1;
-    Expect.equals(1, f);
-    f *= 5;
-    Expect.equals(5, f);
-    f -= 1;
-    Expect.equals(4, f);
-    f ~/= 2;
-    Expect.equals(2, f);
-    f /= 4;
-    Expect.equals(.5, f);
-
-    AssignOpTest.f = 0;
-    AssignOpTest.f += 1;
-    Expect.equals(1, AssignOpTest.f);
-    AssignOpTest.f *= 5;
-    Expect.equals(5, AssignOpTest.f);
-    AssignOpTest.f -= 1;
-    Expect.equals(4, AssignOpTest.f);
-    AssignOpTest.f ~/= 2;
-    Expect.equals(2, AssignOpTest.f);
-    AssignOpTest.f /= 4;
-    Expect.equals(.5, f);
-
-    var o = new AssignOpTest();
-    o.instf = 0;
-    o.instf += 1;
-    Expect.equals(1, o.instf);
-    o.instf *= 5;
-    Expect.equals(5, o.instf);
-    o.instf -= 1;
-    Expect.equals(4, o.instf);
-    o.instf ~/= 2;
-    Expect.equals(2, o.instf);
-    o.instf /= 4;
-    Expect.equals(.5, o.instf);
-
-    var x = 0xFF;
-    x >>= 3;
-    Expect.equals(0x1F, x);
-    x <<= 3;
-    Expect.equals(0xF8, x);
-    x |= 0xF00;
-    Expect.equals(0xFF8, x);
-    x &= 0xF0;
-    Expect.equals(0xF0, x);
-    x ^= 0x11;
-    Expect.equals(0xE1, x);
-
-    var y = 100;
-    y += 1 << 3;
-    Expect.equals(108, y);
-    y *= 2 + 1;
-    Expect.equals(324, y);
-    y -= 3 - 2;
-    Expect.equals(323, y);
-    y += 3 * 4;
-    Expect.equals(335, y);
-
-    var a = [1, 2, 3];
-    var ix = 0;
-    a[ix] |= 12;
-    Expect.equals(13, a[ix]);
-  }
-
-  static var f;
-  var instf;
-}
-
-main() {
-  for (int i = 0; i < 20; i++) {
-    AssignOpTest.testMain();
-  }
-}