Added summary option to cpp11-migrate tool

Added a summary option that enables output to stdout counting the number of
changes each transform has accepted, rejected or deferred.

Patch by Ariel Bernal.


git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@176465 91177308-0d34-0410-b5e6-96231b3b80d8