Merge 97907 - Multiple crashes in RenderTable during layout

Merge 97907 - Multiple crashes in RenderTable during layout
https://bugs.webkit.org/show_bug.cgi?id=70392

Reviewed by Simon Fraser.

Source/WebCore:

Tests: fast/table/crash-anonymous-table-computeLogicalWidth.html
       fast/table/crash-anonymous-table-layout.html

r97555 forgot to take into account anonymous tables during layout
where RenderObject::node() is NULL.

* rendering/RenderTable.cpp:
(WebCore::RenderTable::computeLogicalWidth):
(WebCore::RenderTable::layout):
Added a check for node() before calling Node::hasTagName.

LayoutTests:

* fast/table/crash-anonymous-table-computeLogicalWidth-expected.txt: Added.
* fast/table/crash-anonymous-table-computeLogicalWidth.html: Added.
* fast/table/crash-anonymous-table-layout-expected.txt: Added.
* fast/table/crash-anonymous-table-layout.html: Added.


TBR=jchaffraix@webkit.org
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=98019