During bailout construction add condition instructions to list of live variables.

tests/language/src/ConditionBailoutTest.dart

+// Copyright (c) 2012, 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.
+// Dart test program testing closures.
+
+class A {
+  operator negate() => this;
+
+  foo(x) {
+    -a;
+    if(x) return true;
+    return false;
+  }
+
+  loop1(x) {
+    -a;
+    while(x) return true;
+    return false;
+  }
+
+  loop2(x) {
+    -a;
+    for(;x;) return true;
+    return false;
+  }
+
+  loop3(x) {
+    -a;
+    var i = 0;
+    do {
+      if (i++ == 1) return false;
+    } while(!x);
+    return true;
+  }
+}
+
+var a;
+
+main() {
+  a = new A();
+  Expect.isTrue(a.foo(true));
+  Expect.isTrue(a.loop1(true));
+  Expect.isTrue(a.loop2(true));
+  Expect.isTrue(a.loop3(true));
+}