elang/compiler/analysis: Expose |TypeResolver::Unify()| as public member for for each statement analysis, which need to identify type of iterator.
elang/compiler/analysis: Expose |TypeResolver::Unify()| as public member for for each statement analysis, which need to identify type of iterator.

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