consensus/ethash, params: eip-2384: bump difficulty bomb (#20347)

* consensus/ethash, params: implement eip-2384: bump difficulty bomb

* params: EIP 2384 compat checks

* consensus, params: add Muir Glacier block number (mainnet,ropsten) + official name

* core/forkid: forkid tests for muir glacier

* params/config: address review concerns

* params, core/forkid: review nitpicks

* cmd/geth,eth,les: add override option for muir glacier

* params: nit fix

cmd/geth/config.go

@@ -150,6 +150,9 @@ func makeFullNode(ctx *cli.Context) *node.Node {
 	if ctx.GlobalIsSet(utils.OverrideIstanbulFlag.Name) {
 		cfg.Eth.OverrideIstanbul = new(big.Int).SetUint64(ctx.GlobalUint64(utils.OverrideIstanbulFlag.Name))
 	}
+	if ctx.GlobalIsSet(utils.OverrideMuirGlacierFlag.Name) {
+		cfg.Eth.OverrideMuirGlacier = new(big.Int).SetUint64(ctx.GlobalUint64(utils.OverrideMuirGlacierFlag.Name))
+	}
 	utils.RegisterEthService(stack, &cfg.Eth)
 
 	// Whisper must be explicitly enabled by specifying at least 1 whisper flag or in dev mode

cmd/geth/main.go

@@ -70,6 +70,7 @@ var (
 		utils.NoUSBFlag,
 		utils.SmartCardDaemonPathFlag,
 		utils.OverrideIstanbulFlag,
+		utils.OverrideMuirGlacierFlag,
 		utils.EthashCacheDirFlag,
 		utils.EthashCachesInMemoryFlag,
 		utils.EthashCachesOnDiskFlag,

cmd/utils/flags.go

@@ -237,6 +237,10 @@ var (
 		Name:  "override.istanbul",
 		Usage: "Manually specify Istanbul fork-block, overriding the bundled setting",
 	}
+	OverrideMuirGlacierFlag = cli.Uint64Flag{
+		Name:  "override.muirglacier",
+		Usage: "Manually specify Muir Glacier fork-block, overriding the bundled setting",
+	}
 	// Light server and client settings
 	LightLegacyServFlag = cli.IntFlag{ // Deprecated in favor of light.serve, remove in 2021
 		Name:  "lightserv",