Internalize strings being stored into uninitialized property cells

test/mjsunit/string-slices.js

Index: test/mjsunit/string-slices.js
diff --git a/test/mjsunit/string-slices.js b/test/mjsunit/string-slices.js
index c3f889bd991a1016d7b7f38440e20d59f870372c..52f15061806f97fa12e3441604ce7298bab23296 100644
--- a/test/mjsunit/string-slices.js
+++ b/test/mjsunit/string-slices.js
@@ -193,7 +193,8 @@ assertEquals("\u03B2\u03B3\u03B4\u03B5\u03B4\u03B5\u03B6\u03B7",
     utf.substring(5,1) + utf.substring(3,7));
 
 // Externalizing strings.
-var a = "123456789" + "qwertyuiopasdfghjklzxcvbnm";
+var a = "internalized dummy";
+a = "123456789" + "qwertyuiopasdfghjklzxcvbnm";
 var b = "23456789qwertyuiopasdfghjklzxcvbn"
 assertEquals(a.slice(1,-1), b);