Please answer these questions before submitting pull request

- Why submit this pull request?
- [ ] Bug fix
- [ ] New feature provided
- [ * ] Improve performance

- Related issues
    
    #1610
___
### Bug fix
- Bug description.

- How to fix?

___
### New feature or improvement
- Describe the details and related test reports.

     Guarantees visibility of changes to EnhancedInstance#dynamicField across 
threads


[ Full content available at: 
https://github.com/apache/incubator-skywalking/pull/1611 ]
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