Reviewed by Cameron Zwarich.

        Bug 25674: syntax tree nodes should use arena allocation
        https://bugs.webkit.org/show_bug.cgi?id=25674

        Part two: Remove reference counting from most nodes.

        * JavaScriptCore.exp: Updated.

        * JavaScriptCore.xcodeproj/project.pbxproj: Added ParserArena.h and .cpp.

        * parser/Grammar.y: Replaced uses of ParserRefCountedData with uses of
        ParserArenaData. Took out now-nonfunctional code that tries to manually
        release declaration list. Changed the new calls that create FuncDeclNode
        and FuncExprNode so that they use the proper version of operator new for
        the reference-counted idiom, not the deletion idiom.

        * parser/NodeConstructors.h:
        (JSC::ParserArenaDeletable::operator new): Added.
        (JSC::ParserArenaRefCounted::ParserArenaRefCounted): Added.
        (JSC::Node::Node): Removed ParserRefCounted initializer.
        (JSC::ElementNode::ElementNode): Ditto.
        (JSC::PropertyNode::PropertyNode): Ditto.
        (JSC::ArgumentsNode::ArgumentsNode): Ditto.
        (JSC::SourceElements::SourceElements): Ditto.
        (JSC::ParameterNode::ParameterNode): Ditto.
        (JSC::FuncExprNode::FuncExprNode): Added ParserArenaRefCounted initializer.
        (JSC::FuncDeclNode::FuncDeclNode): Ditto.
        (JSC::CaseClauseNode::CaseClauseNode): Removed ParserRefCounted initializer.
        (JSC::ClauseListNode::ClauseListNode): Ditto.
        (JSC::CaseBlockNode::CaseBlockNode): Ditto.

        * parser/NodeInfo.h: Replaced uses of ParserRefCountedData with uses of
        ParserArenaData.

        * parser/Nodes.cpp:
        (JSC::ScopeNode::ScopeNode): Added ParserArenaRefCounted initializer.
        (JSC::ProgramNode::create): Use the proper version of operator new for
        the reference-counted idiom, not the deletion idiom. Use the arena
        contains function instead of the vecctor find function.
        (JSC::EvalNode::create): Use the proper version of operator new for
        the reference-counted idiom, not the deletion idiom. Use the arena
        reset function instead of the vector shrink function.
        (JSC::FunctionBodyNode::createNativeThunk): Use the proper version
        of operator new for the reference-counted idiom, not the deletion idiom.
        (JSC::FunctionBodyNode::create): More of the same.

        * parser/Nodes.h: Added ParserArenaDeletable and ParserArenaRefCounted
        to replace ParserRefCounted. Fixed inheritance so only the classes that
        need reference counting inherit from ParserArenaRefCounted.

        * parser/Parser.cpp:
        (JSC::Parser::parse): Set m_sourceElements to 0 since it now starts
        uninitialized. Just set it to 0 again in the failure case, since it's
        now just a raw pointer, not an owning one.
        (JSC::Parser::reparseInPlace): Removed now-unneeded get() function.
        (JSC::Parser::didFinishParsing): Replaced uses of ParserRefCountedData
        with uses of ParserArenaData.

        * parser/Parser.h: Less RefPtr, more arena.

        * parser/ParserArena.cpp: Added.
        * parser/ParserArena.h: Added.

        * runtime/JSGlobalData.cpp:
        (JSC::JSGlobalData::~JSGlobalData): Removed arena-related code, since it's
        now in the Parser.
        (JSC::JSGlobalData::createLeaked): Removed unneeded #ifndef.
        (JSC::JSGlobalData::createNativeThunk): Tweaked #if a bit.

        * runtime/JSGlobalData.h: Removed parserArena, which is now in Parser.

        * wtf/RefCounted.h: Added deletionHasBegun function, for use in
        assertions to catch deletion not done by the deref function.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@43479 268f45cc-cd09-0410-ab3c-d52691b4dbfc