[clang-format] Extend AllowShortLoopsOnASingleLine to do ... while loops.

Summary:
If AllowShortLoopsOnASingleLine is enabled,

  do
    a++;
  while (true);

becomes

  do a++;
  while (true);

Reviewers: MyDeveloperDay, mitchell-stellar

Reviewed by: mitchell-stellar

Contributed by: DaanDeMeyer

Subscribers: cfe-commits

Tags: #clang, #clang-format

Differential Revision: https://reviews.llvm.org/D75022