elang/lir: Make |BasicBlockOperands::Iterator| and |Instruction::Values::Iterator| to be derived from |std::iterator<std::forwrad_iterator_tag, T>|.
elang/lir: Make |BasicBlockOperands::Iterator| and |Instruction::Values::Iterator| to be derived from |std::iterator<std::forwrad_iterator_tag, T>|.

eval1749/elang,eval1749/elang,eval1749/elang,eval1749/elang,eval1749/elang