clang-format: Force line break in trailing calls after multline exprs.

Before:
  aaaaaaaa(aaaaaaaaaa,
           bbbbbbbbbb).a();

After:
  aaaaaaaa(aaaaaaaaaa,
           bbbbbbbbbb)
      .a();

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@233304 91177308-0d34-0410-b5e6-96231b3b80d8