Fix for a smi stores optimization on x64 with a test case.

test/mjsunit/compiler/smi-stores-opt.js

Index: test/mjsunit/compiler/smi-stores-opt.js
diff --git a/test/mjsunit/recursive-store-opt.js b/test/mjsunit/compiler/smi-stores-opt.js
similarity index 90%
copy from test/mjsunit/recursive-store-opt.js
copy to test/mjsunit/compiler/smi-stores-opt.js
index fb2649248dbabc642f864f671d0ce2273ad44bd7..ca0923abc99501096d182bcdcd05f6f4020de9c9 100644
--- a/test/mjsunit/recursive-store-opt.js
+++ b/test/mjsunit/compiler/smi-stores-opt.js
@@ -27,15 +27,23 @@
 
 // Flags: --allow-natives-syntax
 
+var o = {a:1.5};
+o.a = 0;
+var a = o.a;
+
 function g() {
-  this.x = this;
+  return 1;
 }
 
+var o2 = {a:{}};
+
 function f() {
-  return new g();
+  var result = {a: a};
+  var literal = {x:g()};
+  return [result, literal];
 }
 
 f();
 f();
 %OptimizeFunctionOnNextCall(f);
-f();
+assertEquals(1, f()[1].x);