Reviewed by Darin Adler.

        Splits RenderBlock::layoutInline into smaller functions
        https://bugs.webkit.org/show_bug.cgi?id=36921

        RenderBlock::layoutInlineChildren is 351 lines long and very difficult
        to comprehend or edit safely. This patch splits it up into a few
        slightly smaller functions.  Most of the code is now in the 241 line
        layoutRunsAndFloats() which is a slight improvement.

        Perf neutral on the page cyclers.  This doesn't introduce any function
        calls into the hottest layout paths inside layoutRunsAndFloats and
        findNextLineBreak.

        No change in behavior, no new tests.

        * rendering/RenderBlock.h:
        (WebCore::RenderBlock::FloatWithRect::FloatWithRect):
        * rendering/RenderBlockLineLayout.cpp:
        (WebCore::RenderBlock::layoutReplacedElements):
        (WebCore::RenderBlock::createLineBoxesForResolver):
        (WebCore::RenderBlock::layoutRunsAndFloats):
        (WebCore::RenderBlock::layoutInlineChildren):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@57030 268f45cc-cd09-0410-ab3c-d52691b4dbfc