Migrate block 44.

tests/language/branch_canonicalization_test.dart

-// Copyright (c) 2013, 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.
-
-// Test that branch fusion correctly sets branch environment for comparisons
-// that require unboxing and does not fuse branches that can deoptimize.
-// VMOptions=--optimization-counter-threshold=10 --no-use-osr --no-background-compilation
-
-import "package:expect/expect.dart";
-
-var sideEffect = true;
-
-barDouble(a, b) {
-  sideEffect = false;
-  final result = (a == b);
-  sideEffect = !sideEffect;
-  return result;
-}
-
-fooDouble(a, b) => barDouble(a, b) ? 1 : 0;
-
-barMint(a, b) {
-  sideEffect = false;
-  final result = (a == b);
-  sideEffect = !sideEffect;
-  return result;
-}
-
-fooMint(a, b) => barMint(a, b) ? 1 : 0;
-
-class A {
-  operator ==(other) => identical(this, other);
-}
-
-class B extends A {}
-
-class C extends A {}
-
-barPoly(a, b) {
-  sideEffect = false;
-  final result = a == b;
-  sideEffect = !sideEffect;
-  return result;
-}
-
-fooPoly(a, b) => barPoly(a, b) ? 1 : 0;
-
-main() {
-  final a = 1.0;
-  final b = 1 << 62;
-  final x = new A(), y = new B(), z = new C();
-  for (var i = 0; i < 20; i++) {
-    Expect.equals(1, fooDouble(a, a));
-    Expect.isTrue(sideEffect);
-    Expect.equals(0, fooMint(b, 0));
-    Expect.isTrue(sideEffect);
-    Expect.equals(1, fooPoly(x, x));
-    Expect.equals(0, fooPoly(y, x));
-  }
-  Expect.equals(1, fooDouble(z, z));
-  Expect.isTrue(sideEffect);
-  Expect.equals(1, fooMint(z, z));
-  Expect.isTrue(sideEffect);
-  Expect.equals(1, fooPoly(z, z));
-  Expect.isTrue(sideEffect);
-}