Merge #8651: Predeclare PrecomputedTransactionData as struct

4424af5 Predeclare PrecomputedTransactionData as sturct (Pieter Wuille)

src/main.h

@@ -38,8 +38,8 @@ class CScriptCheck;
 class CTxMemPool;
 class CValidationInterface;
 class CValidationState;
-class PrecomputedTransactionData;
 
+struct PrecomputedTransactionData;
 struct CNodeStateStats;
 struct LockPoints;