core: raise gas limit in --dev mode, seed blake precompile (#21323)

* Set gasLimit in --dev mode to be 9m.

* core: Set gasLimit to 11.5 milion and add 1 wei allocation for BLAKE2b

Author: madjarevicn

core/genesis.go

@@ -400,7 +400,7 @@ func DeveloperGenesisBlock(period uint64, faucet common.Address) *Genesis {
 	return &Genesis{
 		Config:     &config,
 		ExtraData:  append(append(make([]byte, 32), faucet[:]...), make([]byte, crypto.SignatureLength)...),
-		GasLimit:   6283185,
+		GasLimit:   11500000,
 		Difficulty: big.NewInt(1),
 		Alloc: map[common.Address]GenesisAccount{
 			common.BytesToAddress([]byte{1}): {Balance: big.NewInt(1)}, // ECRecover
@@ -411,6 +411,7 @@ func DeveloperGenesisBlock(period uint64, faucet common.Address) *Genesis {
 			common.BytesToAddress([]byte{6}): {Balance: big.NewInt(1)}, // ECAdd
 			common.BytesToAddress([]byte{7}): {Balance: big.NewInt(1)}, // ECScalarMul
 			common.BytesToAddress([]byte{8}): {Balance: big.NewInt(1)}, // ECPairing
+			common.BytesToAddress([]byte{9}): {Balance: big.NewInt(1)}, // BLAKE2b
 			faucet:                           {Balance: new(big.Int).Sub(new(big.Int).Lsh(big.NewInt(1), 256), big.NewInt(9))},
 		},
 	}