Consensus: Refactor: Separate Consensus::CheckTxInputs and GetSpendHeight in CheckInputs

src/main.h

@@ -507,4 +507,11 @@ extern CCoinsViewCache *pcoinsTip;
 /** Global variable that points to the active block tree (protected by cs_main) */
 extern CBlockTreeDB *pblocktree;
 
+/**
+ * Return the spend height, which is one more than the inputs.GetBestBlock().
+ * While checking, GetBestBlock() refers to the parent block. (protected by cs_main)
+ * This is also true for mempool checks.
+ */
+int GetSpendHeight(const CCoinsViewCache& inputs);
+
 #endif // BITCOIN_MAIN_H