[clang-rename] Fix a crash when renaming a class without definition.

Reviewers: sammccall

Subscribers: cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D68459

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@373748 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed