public static AltBN128AddPrecompiledContract istanbul(final GasCalculator gasCalculator) {
    return new AltBN128AddPrecompiledContract(gasCalculator, 150L);
  }
Create Istanbul AltBN128Add precompiled contract.

@param gasCalculator the gas calculator
@return the AltBN128Add precompiled contract
evm/src/main/java/org/hyperledger/besu/evm/precompile/AltBN128AddPrecompiledContract.java