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

trie/node_test.go

@@ -1,58 +0,0 @@
-// Copyright 2016 The go-ethereum Authors
-// This file is part of the go-ethereum library.
-//
-// The go-ethereum library is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Lesser General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// The go-ethereum library is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU Lesser General Public License for more details.
-//
-// You should have received a copy of the GNU Lesser General Public License
-// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
-
-package trie
-
-import "testing"
-
-func TestCanUnload(t *testing.T) {
-	tests := []struct {
-		flag                 nodeFlag
-		cachegen, cachelimit uint16
-		want                 bool
-	}{
-		{
-			flag: nodeFlag{dirty: true, gen: 0},
-			want: false,
-		},
-		{
-			flag:     nodeFlag{dirty: false, gen: 0},
-			cachegen: 0, cachelimit: 0,
-			want: true,
-		},
-		{
-			flag:     nodeFlag{dirty: false, gen: 65534},
-			cachegen: 65535, cachelimit: 1,
-			want: true,
-		},
-		{
-			flag:     nodeFlag{dirty: false, gen: 65534},
-			cachegen: 0, cachelimit: 1,
-			want: true,
-		},
-		{
-			flag:     nodeFlag{dirty: false, gen: 1},
-			cachegen: 65535, cachelimit: 1,
-			want: true,
-		},
-	}
-
-	for _, test := range tests {
-		if got := test.flag.canUnload(test.cachegen, test.cachelimit); got != test.want {
-			t.Errorf("%+v\n   got %t, want %t", test, got, test.want)
-		}
-	}
-}