880214 - Allow one level deep ropes when creating a DependendString

Status: NEW

(Core :: JavaScript Engine, defect)

Description

[Hannes Verschore [:h4writer]]

Bug 851064 allows one level deep ropes when doing str.substr/str.substring. For same treatment of all places where we take a part of a string, it would make sense to allow all creations of js_newDependendString to have this behaviour.

Normally this shouldn't cause a regression, except for one path as reported in bug 851064. Though this would allow more places to use this and maybe more ways to abuse this system and make performance degradation maybe noticeable. Therefore I would like to do the measurements to make sure we are not hitting this on known string patterns.