https://bugs.webkit.org/show_bug.cgi?id=127266

Reviewed by Geoffrey Garen.

When using Element::attributeAt() in a loop, the compiler had to generate two kinds of
accessor:
-If the element data is unique, the length and data comes from the attribute Vector.
-If the element data is shared, the data comes from the tail of elementData itself.

The choice was done for every access, which caused the assembly to be a little
hard to follow.
This patch unify the data access by doing everything as a array pointer with offset (getting
that data from Vector when necessary).

To make it easier to do the right thing, a new iterator was added so that range-based loops
can replace all the faulty cases.

* css/SelectorChecker.cpp:
(WebCore::anyAttributeMatches):
* css/SelectorChecker.h:
(WebCore::SelectorChecker::checkExactAttribute):
* dom/DatasetDOMStringMap.cpp:
(WebCore::DatasetDOMStringMap::getNames):
(WebCore::DatasetDOMStringMap::item):
(WebCore::DatasetDOMStringMap::contains):
* dom/Element.cpp:
(WebCore::Element::normalizeAttributes):
(WebCore::Element::detachAllAttrNodesFromElement):
(WebCore::Element::cloneAttributesFromElement):
* dom/Element.h:
(WebCore::Element::attributesIterator):
* dom/ElementData.cpp:
(WebCore::ElementData::isEquivalent):
(WebCore::ElementData::findAttributeIndexByNameSlowCase):
* dom/ElementData.h:
(WebCore::AttributeConstIterator::AttributeConstIterator):
(WebCore::AttributeConstIterator::operator*):
(WebCore::AttributeConstIterator::operator->):
(WebCore::AttributeConstIterator::operator++):
(WebCore::AttributeConstIterator::operator==):
(WebCore::AttributeConstIterator::operator!=):
(WebCore::AttributeIteratorAccessor::AttributeIteratorAccessor):
(WebCore::AttributeIteratorAccessor::begin):
(WebCore::AttributeIteratorAccessor::end):
(WebCore::ElementData::attributesIterator):
* dom/Node.cpp:
(WebCore::Node::isDefaultNamespace):
(WebCore::Node::lookupNamespaceURI):
(WebCore::Node::lookupNamespacePrefix):
(WebCore::Node::compareDocumentPosition):
* dom/StyledElement.cpp:
(WebCore::StyledElement::makePresentationAttributeCacheKey):
(WebCore::StyledElement::rebuildPresentationAttributeStyle):
* editing/MarkupAccumulator.cpp:
(WebCore::MarkupAccumulator::appendElement):
* editing/markup.cpp:
(WebCore::completeURLs):
(WebCore::StyledMarkupAccumulator::appendElement):
* html/HTMLEmbedElement.cpp:
(WebCore::HTMLEmbedElement::parametersForPlugin):
* html/HTMLObjectElement.cpp:
(WebCore::HTMLObjectElement::parametersForPlugin):
* inspector/DOMPatchSupport.cpp:
(WebCore::DOMPatchSupport::innerPatchNode):
(WebCore::DOMPatchSupport::createDigest):
* inspector/InspectorDOMAgent.cpp:
(WebCore::InspectorDOMAgent::setAttributesAsText):
(WebCore::InspectorDOMAgent::buildArrayForElementAttributes):
* inspector/InspectorNodeFinder.cpp:
(WebCore::InspectorNodeFinder::matchesElement):
* page/PageSerializer.cpp:
(WebCore::isCharsetSpecifyingNode):
* xml/XPathNodeSet.cpp:
(WebCore::XPath::NodeSet::traversalSort):
* xml/XPathStep.cpp:
(WebCore::XPath::Step::nodesInAxis):
* xml/parser/XMLDocumentParserLibxml2.cpp:
(WebCore::XMLDocumentParser::XMLDocumentParser):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@162394 268f45cc-cd09-0410-ab3c-d52691b4dbfc