Allocation sinking for contexts.

tests/language/vm/load_elimination_mark_stored_values_escaping_test.dart

+// Copyright (c) 2014, 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 correctness of side effects tracking used by load to load forwarding.
+
+// VMOptions=--no-use-osr --optimization-counter-threshold=10 --enable-inlining-annotations
+
+// Tests correct handling of redefinitions in aliasing computation.
+
+import "package:expect/expect.dart";
+
+const alwaysInline = "AlwaysInline";
+const noInline = "NeverInline";
+
+B G;
+
+class A {
+  int val = -1;
+
+  @alwaysInline
+  poly(p) {
+    p.aa = this;
+  }
+}
+
+
+@noInline
+modify() {
+  G.aa.val = 123;
+}
+
+class B {
+ A aa;
+
+ @alwaysInline
+ poly(p) {
+   G = this;
+   foo2(p, this);
+   modify();
+ }
+}
+
+@alwaysInline
+foo(obj, p) => obj.poly(p);
+
+@alwaysInline
+foo2(obj, p) => obj.poly(p);
+
+@noInline
+testfunc() {
+  var a = new A();
+  var b = new B();
+  foo(b, a);
+  return a.val;
+}
+
+main() {
+  foo(new B(), new A());
+  foo(new A(), new B());
+  foo2(new B(), new A());
+  foo2(new A(), new B());
+  for (var i = 0; i < 100; i++) testfunc();
+  Expect.equals(123, testfunc());
+}