Perform CVerifyDB on pcoinsdbview instead of pcoinsTip

Bypassing the main coins cache allows more thorough checking with the same
memory budget.

This has no effect on performance because everything ends up in the child
cache created by VerifyDB itself.

It has bugged me ever since #4675, which effectively reduced the
number of checked blocks to reduce peak memory usage.

- Pass the coinsview to use as argument to VerifyDB

- This also avoids that the first `pcoinsTip->Flush()` after VerifyDB
  writes a large slew of unchanged coin records back to the database.

src/init.cpp

@@ -969,7 +969,7 @@ bool AppInit2(boost::thread_group& threadGroup)
                 }
 
                 uiInterface.InitMessage(_("Verifying blocks..."));
-                if (!CVerifyDB().VerifyDB(GetArg("-checklevel", 3),
+                if (!CVerifyDB().VerifyDB(pcoinsdbview, GetArg("-checklevel", 3),
                               GetArg("-checkblocks", 288))) {
                     strLoadError = _("Corrupted block database detected");
                     break;

src/main.cpp

@@ -3018,7 +3018,7 @@ CVerifyDB::~CVerifyDB()
     uiInterface.ShowProgress("", 100);
 }
 
-bool CVerifyDB::VerifyDB(int nCheckLevel, int nCheckDepth)
+bool CVerifyDB::VerifyDB(CCoinsView *coinsview, int nCheckLevel, int nCheckDepth)
 {
     LOCK(cs_main);
     if (chainActive.Tip() == NULL || chainActive.Tip()->pprev == NULL)
@@ -3031,7 +3031,7 @@ bool CVerifyDB::VerifyDB(int nCheckLevel, int nCheckDepth)
         nCheckDepth = chainActive.Height();
     nCheckLevel = std::max(0, std::min(4, nCheckLevel));
     LogPrintf("Verifying last %i blocks at level %i\n", nCheckDepth, nCheckLevel);
-    CCoinsViewCache coins(*pcoinsTip, true);
+    CCoinsViewCache coins(*coinsview, true);
     CBlockIndex* pindexState = chainActive.Tip();
     CBlockIndex* pindexFailure = NULL;
     int nGoodTransactions = 0;

src/main.h

@@ -942,7 +942,7 @@ class CVerifyDB {
 public:
     CVerifyDB();
     ~CVerifyDB();
-    bool VerifyDB(int nCheckLevel, int nCheckDepth);
+    bool VerifyDB(CCoinsView *coinsview, int nCheckLevel, int nCheckDepth);
 };
 
 /** An in-memory indexed chain of blocks. */

src/rpcblockchain.cpp

@@ -430,7 +430,7 @@ Value verifychain(const Array& params, bool fHelp)
     if (params.size() > 1)
         nCheckDepth = params[1].get_int();
 
-    return CVerifyDB().VerifyDB(nCheckLevel, nCheckDepth);
+    return CVerifyDB().VerifyDB(pcoinsTip, nCheckLevel, nCheckDepth);
 }
 
 Value getblockchaininfo(const Array& params, bool fHelp)