Handle trailing underscores on modernize-loop-convert variable namer. Summary: https://llvm.org/bugs/show_bug.cgi?id=24961. Reviewers: klimek Subscribers: cfe-commits, alexfh Differential Revision: http://reviews.llvm.org/D13381 llvm-svn: 249127 GitOrigin-RevId: 88d204442be24dd691ad95078e86565cb0321831