Bug 210253

After r259781, debug hooks are now generated for all but the first sub-expression in a comma expression. [Source/JavaScriptCore/bytecompiler/NodesCodegen.cpp](http://trac.webkit.org/changeset/259781/webkit/trunk/Source/JavaScriptCore/bytecompiler/NodesCodegen.cpp): ``` RegisterID* CommaNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst) { for (; node->next(); node = node->next()) { generator.emitNode(generator.ignoredResult(), node->m_expr); // Don't emit a debug hook for the first expression, as that should've already happened in // the containing statement. generator.emitDebugHook(node->next()->m_expr); } return generator.emitNodeInTailPosition(dst, node->m_expr); } ``` This comment is inaccurate, as in the simple case of `true && (a(), b())`.