See sanitizer log here, we have a use after scope:
https://build.bitcoinabc.org/viewLog.html?buildId=29430&buildTypeId=BitcoinABC_Master_BitcoinAbcMasterAsan&tab=artifacts
The order of destructor cleanup is reverse of declaration order.
Thus we need `nSigChecksBlockLimiter` to be declared before `control` which is the RAII on all script check worker threads having finished their work.
(D5179)