Merge bitcoin/bitcoin#25264: kernel: pass params to BlockManager rather than using a global

a4741bd kernel: pass params to BlockManager rather than using a global (Cory Fields)

Pull request description:

  In a discussion today, dongcarl and I realized that is the only usage of the global `Params()` left in the kernel code.

  We can use the readily available reference in `ChainstateManager` instead.

  Note: There are still some uses of `BaseParams` in the kernel, so it doesn't make sense to rearrange the definitions quite yet. Once those are gone we can split the globals into new files.

ACKs for top commit:
  MarcoFalke:
    cr ACK a4741bd
  laanwj:
    Code review ACK a4741bd

Tree-SHA512: bfcc0c35e6c23689e968ccc96ceda39dd5a47fe94fbe617902110fe5865c30a40ea614bcfd4b4a2c846d2e84340aa8973e70b0938786af0fecfa3e6016d7fcad

Author: laanwj

src/node/blockstorage.cpp

@@ -318,9 +318,9 @@ bool BlockManager::WriteBlockIndexDB()
     return true;
 }
 
-bool BlockManager::LoadBlockIndexDB()
+bool BlockManager::LoadBlockIndexDB(const Consensus::Params& consensus_params)
 {
-    if (!LoadBlockIndex(::Params().GetConsensus())) {
+    if (!LoadBlockIndex(consensus_params)) {
         return false;
     }
 

src/node/blockstorage.h

@@ -153,7 +153,7 @@ class BlockManager
     std::unique_ptr<CBlockTreeDB> m_block_tree_db GUARDED_BY(::cs_main);
 
     bool WriteBlockIndexDB() EXCLUSIVE_LOCKS_REQUIRED(::cs_main);
-    bool LoadBlockIndexDB() EXCLUSIVE_LOCKS_REQUIRED(::cs_main);
+    bool LoadBlockIndexDB(const Consensus::Params& consensus_params) EXCLUSIVE_LOCKS_REQUIRED(::cs_main);
 
     CBlockIndex* AddToBlockIndex(const CBlockHeader& block, CBlockIndex*& best_header) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
     /** Create a new block index entry for a given block hash */

src/validation.cpp

@@ -4158,7 +4158,7 @@ bool ChainstateManager::LoadBlockIndex()
     // Load block index from databases
     bool needs_init = fReindex;
     if (!fReindex) {
-        bool ret = m_blockman.LoadBlockIndexDB();
+        bool ret = m_blockman.LoadBlockIndexDB(GetConsensus());
         if (!ret) return false;
 
         std::vector<CBlockIndex*> vSortedByHeight{m_blockman.GetAllBlockIndices()};