REGRESSION(r82611) InlineBox has 33 bits of bitset, causing alignment issues and...

REGRESSION(r82611) InlineBox has 33 bits of bitset, causing alignment issues and extra memory use.
https://bugs.webkit.org/show_bug.cgi?id=64914

Patch by Andreas Kling <kling@webkit.org> on 2011-09-30
Reviewed by Antti Koivisto.

Remove InlineBox::prevOnLineExists() and its two accompanying bitfields
since nobody is using them anymore. nextOnLineExists() is still used by
GTK+ accessibility code.

Also added a compile-time assertion to guard against future bloating of
the InlineBox class.

* rendering/InlineBox.cpp:
(WebCore::SameSizeAsInlineBox::~SameSizeAsInlineBox):
* rendering/InlineBox.h:
(WebCore::InlineBox::InlineBox):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@96422 268f45cc-cd09-0410-ab3c-d52691b4dbfc