[runtime][ic] Constant field tracking support.

test/mjsunit/field-type-tracking.js

Index: test/mjsunit/field-type-tracking.js
diff --git a/test/mjsunit/field-type-tracking.js b/test/mjsunit/field-type-tracking.js
index 447ec1590e9e2019a823bace97fca8c783e875ed..e6b19b9bbc864de66ad3b91ab3248e6d46bdb9f9 100644
--- a/test/mjsunit/field-type-tracking.js
+++ b/test/mjsunit/field-type-tracking.js
@@ -8,6 +8,9 @@
 (function() {
   var o = { text: "Hello World!" };
   function A() {
+    // Assign twice to make the field non-constant.
+    // TODO(ishell): update test once constant field tracking is done.
+    this.a = {text: 'foo'};
     this.a = o;
   }
   function readA(x) {
@@ -108,6 +111,9 @@
 
 (function() {
   function Foo(x) { this.x = x; }
+  // TODO(ishell): update test once constant field tracking is done.
+  var f0 = new Foo({x: 0});
+  f0.x = {x: 0};  // make Foo.x non-constant here.
   var f1 = new Foo({x: 1});
   var f2 = new Foo({x: 2});
   var f3 = new Foo({x: 3});
@@ -144,7 +150,9 @@
   function baz(f, y) { f.y = y; }
   baz(f1, {y: 9});
   baz(f2, {y: 9});
+  baz(f2, {y: 9});
   %OptimizeFunctionOnNextCall(baz);
+  baz(f2, {y: 9});
   baz(f3, {a: -1});
   assertUnoptimized(baz);
 })();