Ensure the constant operand for heap-object store-named-field is not a smi.

test/mjsunit/regress/regress-store-heapobject.js

Index: test/mjsunit/regress/regress-store-heapobject.js
diff --git a/test/mjsunit/regress/regress-check-eliminate-loop-phis.js b/test/mjsunit/regress/regress-store-heapobject.js
similarity index 52%
copy from test/mjsunit/regress/regress-check-eliminate-loop-phis.js
copy to test/mjsunit/regress/regress-store-heapobject.js
index 3791c35f71ccfc50dd384978e449103b39f6bff7..9f2a1b8ffadf093ed39d99f00807344fcb51d853 100644
--- a/test/mjsunit/regress/regress-check-eliminate-loop-phis.js
+++ b/test/mjsunit/regress/regress-store-heapobject.js
@@ -4,18 +4,24 @@
 
 // Flags: --allow-natives-syntax
 
-function f() {
-  var o = {x:1};
-  var y = {y:2.5, x:0};
-  var result;
-  for (var i = 0; i < 2; i++) {
-    result = o.x + 3;
-    o = y;
+var o = {a: undefined};
+
+function store(o, v) {
+  o.a = v;
+}
+
+store(o, undefined);
+store(o, undefined);
+
+function f(bool) {
+  var o = {a: undefined};
+  if (bool) {
+    store(o, 1);
   }
-  return result;
+  return o;
 }
 
-f();
-f();
+f(false);
+f(false);
 %OptimizeFunctionOnNextCall(f);
-assertEquals(3, f());
+f(true);