BREAKING CHANGE: Remove === and !== in the VM compiler

tests/language/canonical_const_test.dart

Index: tests/language/canonical_const_test.dart
===================================================================
--- tests/language/canonical_const_test.dart	(revision 23747)
+++ tests/language/canonical_const_test.dart	(working copy)
@@ -23,7 +23,7 @@
     Expect.isFalse(identical(const C1(), const C2()));
     Expect.identical(B, const C2());
     // TODO(johnlenz): these two values don't currently have the same type
-    // Expect.isTrue(const [1,2] === const List[1,2]);
+    // Expect.identical(const [1,2], const List[1,2]);
     Expect.isFalse(identical(const [2,1], const[1,2]));
     Expect.identical(const <int>[1,2], const <int>[1,2]);
     Expect.identical(const <Object>[1,2], const <Object>[1,2]);