Improve readability of CXX method overrides list

Summary:
Separate CXX method overrides list entries with commas.

Reviewers: lhames

Reviewed By: lhames

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D35800



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@309496 91177308-0d34-0410-b5e6-96231b3b80d8