Stress GC less by allocating exponentially growing string chunks in JSON.stringify.

test/mjsunit/json.js

Index: test/mjsunit/json.js
diff --git a/test/mjsunit/json.js b/test/mjsunit/json.js
index 582414fec838d50d16c877a460459df921df9de2..8d8ca336c9e5a6b76b5f83b27bddbf356f2ff628 100644
--- a/test/mjsunit/json.js
+++ b/test/mjsunit/json.js
@@ -268,11 +268,14 @@ assertEquals('"toJSON 123"',
              JSON.stringify({ toJSON : function() { return 'toJSON 123'; } }));
 assertEquals('{"a":321}',
              JSON.stringify({ a : { toJSON : function() { return 321; } } }));
+var counter = 0;
 assertEquals('{"getter":123}',
-             JSON.stringify({ get getter() { return 123; } }));
+             JSON.stringify({ get getter() { counter++; return 123; } }));
+assertEquals(1, counter);
 assertEquals('{"a":"abc","b":"\u1234bc"}',
              JSON.stringify({ a : "abc", b : "\u1234bc" }));
 
+
 var a = { a : 1, b : 2 };
 delete a.a;
 assertEquals('{"b":2}', JSON.stringify(a));