Use __func__ to get function name for output printing

src/main.cpp

@@ -4159,7 +4159,7 @@ CBlockIndex * InsertBlockIndex(uint256 hash)
     // Create new
     CBlockIndex* pindexNew = new CBlockIndex();
     if (!pindexNew)
-        throw runtime_error("LoadBlockIndex(): new CBlockIndex failed");
+        throw runtime_error(std::string(__func__) + ": new CBlockIndex failed");
     mi = mapBlockIndex.insert(make_pair(hash, pindexNew)).first;
     pindexNew->phashBlock = &((*mi).first);