fix up stats macros to use atomic get/set #781
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Description
Describe the purpose of and changes within this Pull Request.
Our stats macros were using plain read/write operations, which could result in torn values. This was somewhat acceptable, but we might as well ensure the operations are atomic.
Testing
Do any existing tests cover this change? Are new tests needed?
CI.
Documentation
Is there any documentation impact for this change?
No.
Installation
Is there any installer impact for this change?
No.