cmd, core, eth, trie: get rid of trie cache generations (#19262)

* cmd, core, eth, trie: get rid of trie cache generations

* core, trie: get rid of remainder of cache gen boilerplate

cmd/geth/chaincmd.go

@@ -35,7 +35,6 @@ import (
 	"github.com/ethereum/go-ethereum/eth/downloader"
 	"github.com/ethereum/go-ethereum/event"
 	"github.com/ethereum/go-ethereum/log"
-	"github.com/ethereum/go-ethereum/trie"
 	"gopkg.in/urfave/cli.v1"
 )
 
@@ -261,9 +260,6 @@ func importChain(ctx *cli.Context) error {
 	}
 	fmt.Println(ioStats)
 
-	fmt.Printf("Trie cache misses:  %d\n", trie.CacheMisses())
-	fmt.Printf("Trie cache unloads: %d\n\n", trie.CacheUnloads())
-
 	// Print the memory statistics used by the importing
 	mem := new(runtime.MemStats)
 	runtime.ReadMemStats(mem)

cmd/geth/main.go

@@ -102,7 +102,6 @@ var (
 		utils.CacheDatabaseFlag,
 		utils.CacheTrieFlag,
 		utils.CacheGCFlag,
-		utils.TrieCacheGenFlag,
 		utils.ListenPortFlag,
 		utils.MaxPeersFlag,
 		utils.MaxPendingPeersFlag,

cmd/geth/usage.go

@@ -139,7 +139,6 @@ var AppHelpFlagGroups = []flagGroup{
 			utils.CacheDatabaseFlag,
 			utils.CacheTrieFlag,
 			utils.CacheGCFlag,
-			utils.TrieCacheGenFlag,
 		},
 	},
 	{