More optimizations cleanup.

tests/language/src/OptimizationTest.dart

+// 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.
+// Test various optimizations and deoptimizations of optimizing compiler..
+
+addThem(a, b) {
+  return a + b;
+}
+
+isItInt(a) {
+  return a is int;
+}
+
+doNeg(a) {
+  return -a;
+}
+
+doNot(a) {
+  return !a;
+}
+
+doBitNot(a) {
+  return ~a;
+}
+
+main() {
+  for (int i = 0; i < 2000; i++) {
+    Expect.stringEquals("HI 5", addThem("HI ", 5));
+    Expect.equals(true, isItInt(5));
+  }
+  Expect.equals(8, addThem(3, 5));
+  for (int i = 0; i < 2000; i++) {
+    Expect.stringEquals("HI 5", addThem("HI ", 5));
+    Expect.equals(8, addThem(3, 5));
+  }
+  for (int i = -500; i < 500; i++) {
+    var r = doNeg(i);
+    var p = doNeg(r);
+    Expect.equals(i, p);
+  }
+  var maxSmi = (1 << 30) - 1;
+  Expect.equals(maxSmi, doNeg(doNeg(maxSmi)));
+  // Deoptimize because of overflow.
+  var minInt = -(1 << 30);
+  Expect.equals(minInt, doNeg(doNeg(minInt)));
+  
+  for (int i = 0; i < 1000; i++) {
+    Expect.equals(false, doNot(true));
+    Expect.equals(true, doNot(doNot(true)));
+  }
+  for (int i = 0; i < 1000; i++) {
+    Expect.equals(-57, doBitNot(56));
+    Expect.equals(55, doBitNot(-56));
+  }
+}