[ADT] Add make_scope_exit().

Summary: make_scope_exit() is described in C++ proposal p0052r2, which uses RAII to do cleanup works at scope exit.

Reviewers: chandlerc

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D22796

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@278251 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed