When canonicalizing branch on StrictCompare ensure that branch gets correct environment.

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.
+
+barDouble(a, b) => a == b;
+fooDouble(a, b) => barDouble(a, b) ? 1 : 0;
+
+barMint(a, b) => a == b;
+fooMint(a, b) => barMint(a, b) ? 1 : 0;
+
+main () {
+  final a = 1.0;
+  final b = 1 << 62;
+  for (var i = 0; i < 10000; i++) {
+    Expect.equals(1, fooDouble(a, a));
+    Expect.equals(0, fooMint(b, 0));

[Florian Schneider, 2013/02/13 11:22:11]

Thanks for adding the test. Do we have a test covering the case where the
comparison itself can deoptimize? (e.g. as in EmitEqualityAsPolymorphicCall)

+  }
+}
+
+
+