[clang-tidy] Add "MakeSmartPtrFunction" option to modernize-make-shared/unique checks.

Reviewers: alexfh, aaron.ballman

Reviewed By: alexfh

Subscribers: JDevlieghere, Eugene.Zelenko, xazax.hun, cfe-commits

Differential Revision: https://reviews.llvm.org/D34206

llvm-svn: 307130