Merge 145034 "Make RuleData support up to 8191 selectors"

Merge 145034 "Make RuleData support up to 8191 selectors"

> Make RuleData support up to 8191 selectors
> https://bugs.webkit.org/show_bug.cgi?id=111663
> 
> Patch by Philippe Liard <pliard@chromium.org>; on 2013-03-06
> Reviewed by Andreas Kling.
> 
> r125294 made RuleData consume less memory by replacing a pointer with
> an index encoded on 12 bits.
> This unfortunately breaks Chrome for Android (and others) when a lot of
> CSS is used or more precisely when selectorIndex cannot be stored on 12
> bits.
> 
> Threfore this change decreases the number of bits used to store
> m_position by 1 (from 19 to 18) and adds this extra bit to
> m_selectorIndex so that values up to 8191 can be stored safely without
> overflowing.
> 
> * css/RuleSet.h:
> (RuleData):

TBR=commit-queue@webkit.org
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=145434

[Xianzhu, 2013-03-11 23:52:02]

Committed patchset #1 manually as r145434.