Revert "Reland "VM: Handle null-comparisons in the flow graph type propagation""

tests/language/vm/integer_type_propagation_test.dart

Index: tests/language/vm/integer_type_propagation_test.dart
diff --git a/tests/language/vm/integer_type_propagation_test.dart b/tests/language/vm/integer_type_propagation_test.dart
deleted file mode 100644
index 3b33750d4f73f0efa9e03afc51042173d35a4192..0000000000000000000000000000000000000000
--- a/tests/language/vm/integer_type_propagation_test.dart
+++ /dev/null
@@ -1,27 +0,0 @@
-// Copyright (c) 2017, 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 various optimizations and deoptimizations of optimizing compiler..
-// VMOptions=--checked --enable-inlining-annotations --no-background-compilation --optimization-counter-threshold=1000
-
-import "package:expect/expect.dart";
-
-const noInline = "NeverInline";
-
-@noInline
-testuint32(y) {
-  int x = y;
-  if (x != null) {
-    return x & 0xffff;
-  }
-}
-
-main() {
-  var s = 0;
-  testuint32(0x7fffffff);
-  for (int i = 0; i < 10000; ++i) {
-    testuint32(i);
-  }
-  Expect.equals(65535, testuint32(0x7fffffff));
-  Expect.equals(65535, testuint32(0x7fff23452435245ffff));
-}