Keep prototype maps in dictionary mode until ICs see them

test/mjsunit/regress/regress-put-prototype-transition.js

Index: test/mjsunit/regress/regress-put-prototype-transition.js
diff --git a/test/mjsunit/regress/regress-put-prototype-transition.js b/test/mjsunit/regress/regress-put-prototype-transition.js
index 70f0074683bc87204328c66cb5384f6cb10e3264..c5b4c5abc0740baaffa79059d7b34a33cbd70cae 100644
--- a/test/mjsunit/regress/regress-put-prototype-transition.js
+++ b/test/mjsunit/regress/regress-put-prototype-transition.js
@@ -30,7 +30,7 @@ function __f_1(__v_4, add_first, __v_6, same_map_as) {
     __f_4(__v_1);
     assertFalse(%HasFastProperties(__v_1));
     __f_0(__v_1, __v_6);
-    assertTrue(%HasFastProperties(__v_1));
+    assertFalse(%HasFastProperties(__v_1));
   } else {
     __f_0(__v_1, __v_6);
     assertTrue(%HasFastProperties(__v_1));