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Prevent mutex lock fail even if --enable-debug
This PR intends to resolve #15227. "configure --debug-enabled" enables "#ifdef DEBUG_LOCKORDER". Then "lockdata" (in sync.cpp) will be initialized same as other static objects. But unfortunately, lockdata.push_lock() was called before its initialization (via initializing signatureCache which is declared in script/sigcache.cpp) on macOS. This PR apply the "Construct On First Use Idiom" to "lockdata" to prevent it.
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