Source/JavaScriptCore: [JSC] WebKit allocates gigabytes of memory when doing repeated string concatenation
https://bugs.webkit.org/show_bug.cgi?id=63918

Patch by Mark Hahnenberg <mhahnenberg@apple.com> on 2011-07-19
Reviewed by Darin Adler.

When allocating JSStrings during concatenation, we needed to call the Heap's reportExtraMemoryCost
method due to additional string copying within several of the constructors when dealing with 
UStrings.  This has been added to the UString version of the appendStringInConstruct method 
within the JSString class.

* runtime/JSString.h:
(JSC::RopeBuilder::JSString):
(JSC::RopeBuilder::appendStringInConstruct):

LayoutTests: Chromium rebaselines r91269 and r91277.

Patch by Ryosuke Niwa <rniwa@webkit.org> on 2011-07-19

* platform/chromium-linux/svg/W3C-SVG-1.1-SE/styling-pres-02-f-expected.png: Added.
* platform/chromium-mac/fast/table/align-right-within-left-aligned-div-expected.png: Added.
* platform/chromium-mac/fast/table/align-right-within-left-aligned-div-expected.txt: Added.
* platform/chromium-mac/svg/W3C-SVG-1.1-SE/styling-pres-02-f-expected.png: Added.
* platform/chromium-win/svg/W3C-SVG-1.1-SE/styling-pres-02-f-expected.png: Added.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@91290 268f45cc-cd09-0410-ab3c-d52691b4dbfc