tests: define MuirGlacier fork (ethereum#26856)

add muir glacier to t8n

Author: gurukamath

tests/init.go

@@ -90,6 +90,19 @@ var Forks = map[string]*params.ChainConfig{
 		PetersburgBlock:     big.NewInt(0),
 		IstanbulBlock:       big.NewInt(0),
 	},
+	"MuirGlacier": {
+		ChainID:             big.NewInt(1),
+		HomesteadBlock:      big.NewInt(0),
+		EIP150Block:         big.NewInt(0),
+		EIP155Block:         big.NewInt(0),
+		EIP158Block:         big.NewInt(0),
+		DAOForkBlock:        big.NewInt(0),
+		ByzantiumBlock:      big.NewInt(0),
+		ConstantinopleBlock: big.NewInt(0),
+		PetersburgBlock:     big.NewInt(0),
+		IstanbulBlock:       big.NewInt(0),
+		MuirGlacierBlock:    big.NewInt(0),
+	},
 	"FrontierToHomesteadAt5": {
 		ChainID:        big.NewInt(1),
 		HomesteadBlock: big.NewInt(5),