Fix polymorphic inlined calls with migrating prototypes

test/mjsunit/regress/regress-calls-with-migrating-prototypes.js

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 // Flags: --allow-natives-syntax
 
-function inlined() {
-    return 1;
+function f() {
+ return 1;
 }
-
-function foo() {
-    if ((inlined() + 0.5) == null) return "null";
-    return "non-null";
+function C1(f) {
+ this.f = f;
 }
-
-assertEquals("non-null", foo());
-assertEquals("non-null", foo());
+var o1 = new C1(f);
+var o2 = {__proto__: new C1(f) }
+function foo(o) {
+ return o.f();
+}
+foo(o1);
+foo(o1);
+foo(o2);
+foo(o1);
+var o3 = new C1(function() { return 2; });
 %OptimizeFunctionOnNextCall(foo);
-assertEquals("non-null", foo());
+assertEquals(1, foo(o2));
+o2.__proto__.f = function() { return 3; };
+assertEquals(3, foo(o2));