[clang-format] NFC clang-format the clang-format unit tests
It is annoying that the clang-format tests aren't themselves clang-formatted, if you use a format on save option in VS or vim this file gets massively changed then you have to git difftool all the other changes back out, which is risky.
I know people don't like mass clang-format changes but sometimes it becomes unmanageable to not. There are no other changes here other than just the reformat.
clang-format tests all pass.
[==========] 691 tests from 21 test cases ran. (55990 ms total) [ PASSED ] 691 tests.
Reviewers: klimek, owenpan, timwoj
Reviewed By: owenpan
Tags: #clang-tools-extra, #clang
Differential Revision: https://reviews.llvm.org/D67888