Replace LoadNamedFieldPolymorphic with explicit branches.

test/mjsunit/load_poly_effect.js

Index: test/mjsunit/load_poly_effect.js
diff --git a/test/mjsunit/array-non-smi-length.js b/test/mjsunit/load_poly_effect.js
similarity index 82%
copy from test/mjsunit/array-non-smi-length.js
copy to test/mjsunit/load_poly_effect.js
index 23a25ee797bd68690ad2a7ce26a9135e23b486e2..7663d86ad0fba67afabc751af8254d92542c00b3 100644
--- a/test/mjsunit/array-non-smi-length.js
+++ b/test/mjsunit/load_poly_effect.js
@@ -27,20 +27,21 @@
 
 // Flags: --allow-natives-syntax
 
-function TestNonSmiArrayLength() {
-  function f(a) {
-    return a.length+1;
-  }
+var o = {};
+var count = 0;
+Object.defineProperty(o, "x", {get:function(){count++;return 100}});
 
-  var a = [];
-  a.length = 0xFFFF;
-  assertSame(0x10000, f(a));
-  assertSame(0x10000, f(a));
-
-  %OptimizeFunctionOnNextCall(f);
-  a.length = 0xFFFFFFFF;
-  assertSame(0x100000000, f(a));
+function load(o, o2) {
+  return 1 + (o.x, o2.x_tagged);
 }
 
-TestNonSmiArrayLength();
+var deopt = false;
+var o2 = {x_tagged:{}};
+o2.x_tagged = 1;
 
+load({x:1}, o2);
+load({x:1}, o2);
+print(load(o, o2));
+%OptimizeFunctionOnNextCall(load);
+o2.x_tagged = true;
+print(load(o, o2));