Reviewed by darin.

        Add ExpressionNode subclass of Node, use it.

        * kjs/grammar.y:
        * kjs/nodes.cpp:
        (KJS::ForInNode::ForInNode):
        * kjs/nodes.h:
        (KJS::ExpressionNode::):
        (KJS::NullNode::):
        (KJS::NullNode::precedence):
        (KJS::BooleanNode::):
        (KJS::BooleanNode::precedence):
        (KJS::RegExpNode::):
        (KJS::RegExpNode::precedence):
        (KJS::ThisNode::):
        (KJS::ThisNode::precedence):
        (KJS::ResolveNode::):
        (KJS::ElementNode::):
        (KJS::ArrayNode::):
        (KJS::PropertyNode::):
        (KJS::PropertyNode::precedence):
        (KJS::PropertyNode::name):
        (KJS::PropertyListNode::):
        (KJS::ObjectLiteralNode::):
        (KJS::ObjectLiteralNode::precedence):
        (KJS::BracketAccessorNode::):
        (KJS::DotAccessorNode::):
        (KJS::DotAccessorNode::precedence):
        (KJS::ArgumentListNode::):
        (KJS::ArgumentsNode::):
        (KJS::NewExprNode::):
        (KJS::NewExprNode::precedence):
        (KJS::FunctionCallValueNode::):
        (KJS::FunctionCallValueNode::precedence):
        (KJS::FunctionCallResolveNode::):
        (KJS::FunctionCallBracketNode::):
        (KJS::FunctionCallBracketNode::precedence):
        (KJS::FunctionCallDotNode::):
        (KJS::FunctionCallDotNode::precedence):
        (KJS::PrePostResolveNode::):
        (KJS::PostfixBracketNode::):
        (KJS::PostfixBracketNode::precedence):
        (KJS::PostIncBracketNode::):
        (KJS::PostIncBracketNode::isIncrement):
        (KJS::PostDecBracketNode::):
        (KJS::PostDecBracketNode::isIncrement):
        (KJS::PostfixDotNode::):
        (KJS::PostfixDotNode::precedence):
        (KJS::PostIncDotNode::):
        (KJS::PostIncDotNode::isIncrement):
        (KJS::PostDecDotNode::):
        (KJS::PostDecDotNode::isIncrement):
        (KJS::PostfixErrorNode::):
        (KJS::PostfixErrorNode::precedence):
        (KJS::DeleteResolveNode::):
        (KJS::DeleteBracketNode::):
        (KJS::DeleteBracketNode::precedence):
        (KJS::DeleteDotNode::):
        (KJS::DeleteDotNode::precedence):
        (KJS::DeleteValueNode::):
        (KJS::DeleteValueNode::precedence):
        (KJS::VoidNode::):
        (KJS::VoidNode::precedence):
        (KJS::TypeOfResolveNode::):
        (KJS::TypeOfValueNode::):
        (KJS::PrefixBracketNode::):
        (KJS::PrefixBracketNode::precedence):
        (KJS::PreIncBracketNode::):
        (KJS::PreIncBracketNode::isIncrement):
        (KJS::PreDecBracketNode::):
        (KJS::PreDecBracketNode::isIncrement):
        (KJS::PrefixDotNode::):
        (KJS::PrefixDotNode::precedence):
        (KJS::PreIncDotNode::):
        (KJS::PreIncDotNode::isIncrement):
        (KJS::PreDecDotNode::):
        (KJS::PreDecDotNode::isIncrement):
        (KJS::PrefixErrorNode::):
        (KJS::PrefixErrorNode::precedence):
        (KJS::UnaryPlusNode::):
        (KJS::UnaryPlusNode::precedence):
        (KJS::NegateNode::):
        (KJS::NegateNode::precedence):
        (KJS::BitwiseNotNode::):
        (KJS::BitwiseNotNode::precedence):
        (KJS::LogicalNotNode::):
        (KJS::LogicalNotNode::precedence):
        (KJS::AddNode::):
        (KJS::AddNode::precedence):
        (KJS::LeftShiftNode::):
        (KJS::LeftShiftNode::precedence):
        (KJS::RightShiftNode::):
        (KJS::RightShiftNode::precedence):
        (KJS::UnsignedRightShiftNode::):
        (KJS::UnsignedRightShiftNode::precedence):
        (KJS::LessNode::):
        (KJS::LessNode::precedence):
        (KJS::GreaterNode::):
        (KJS::GreaterNode::precedence):
        (KJS::LessEqNode::):
        (KJS::LessEqNode::precedence):
        (KJS::GreaterEqNode::):
        (KJS::GreaterEqNode::precedence):
        (KJS::InstanceOfNode::):
        (KJS::InstanceOfNode::precedence):
        (KJS::InNode::):
        (KJS::InNode::precedence):
        (KJS::EqualNode::):
        (KJS::EqualNode::precedence):
        (KJS::NotEqualNode::):
        (KJS::NotEqualNode::precedence):
        (KJS::StrictEqualNode::):
        (KJS::StrictEqualNode::precedence):
        (KJS::NotStrictEqualNode::):
        (KJS::NotStrictEqualNode::precedence):
        (KJS::BitAndNode::):
        (KJS::BitAndNode::precedence):
        (KJS::BitOrNode::):
        (KJS::BitOrNode::precedence):
        (KJS::BitXOrNode::):
        (KJS::BitXOrNode::precedence):
        (KJS::LogicalAndNode::):
        (KJS::LogicalAndNode::precedence):
        (KJS::LogicalOrNode::):
        (KJS::LogicalOrNode::precedence):
        (KJS::ConditionalNode::):
        (KJS::ConditionalNode::precedence):
        (KJS::ReadModifyResolveNode::):
        (KJS::ReadModifyResolveNode::precedence):
        (KJS::AssignResolveNode::):
        (KJS::AssignResolveNode::precedence):
        (KJS::ReadModifyBracketNode::):
        (KJS::ReadModifyBracketNode::precedence):
        (KJS::AssignBracketNode::):
        (KJS::AssignBracketNode::precedence):
        (KJS::AssignDotNode::):
        (KJS::AssignDotNode::precedence):
        (KJS::ReadModifyDotNode::):
        (KJS::ReadModifyDotNode::precedence):
        (KJS::AssignErrorNode::):
        (KJS::AssignErrorNode::precedence):
        (KJS::CommaNode::):
        (KJS::CommaNode::precedence):
        (KJS::AssignExprNode::):
        (KJS::AssignExprNode::precedence):
        (KJS::ExprStatementNode::):
        (KJS::IfNode::):
        (KJS::DoWhileNode::):
        (KJS::WhileNode::):
        (KJS::ReturnNode::):
        (KJS::WithNode::):
        (KJS::ThrowNode::):
        (KJS::ParameterNode::):
        (KJS::CaseClauseNode::):
        (KJS::CaseClauseNode::precedence):
        (KJS::ClauseListNode::):
        (KJS::SwitchNode::):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@27622 268f45cc-cd09-0410-ab3c-d52691b4dbfc