1. No id follow '[CNode]';
2. Miss TraceTransform info after TransformClone().

1. Use static 'name' and 'symbol' for TraceInfo, avoid copy them;
2. Refactor DebugInfo, move 'debug_id' down to GraphDebugInfo;
3. Make Location, TraceContext immutable;
4. Optimize trace context stack, use value instead of shared_ptr;
5. TraceInfo, DebugInfo no longer inherit from Base.

endless issue.