[ADT] Change iterator_adaptor_base's default template arguments to forward more underlying typedefs

Reviewers: chandlerc

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D23217

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@278157 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed