Log when trimming block solutions

src/main.cpp

@@ -3713,9 +3713,12 @@ bool static FlushStateToDisk(CValidationState &state, FlushStateMode mode) {
                 // Now that we have written the block indices to the database, we do not
                 // need to store solutions for these CBlockIndex objects in memory.
                 // cs_main must be held here.
+                uint32_t nTrimmed = 0;
                 for (CBlockIndex *pblockindex : vBlocks) {
                     pblockindex->TrimSolution();
+                    ++nTrimmed;
                 }
+                LogPrintf("%s: trimmed %d solutions from block index\n", __func__, nTrimmed);
             }
             // Finally remove any pruned files
             if (fFlushForPrune)