* Removing stray semicolons (discovered by running clang-format v12 followed by tools/check-style.sh). (#3087)
* Manually moving `// NOLINT` comments so that clang-format does not move them to the wrong places.
* Manually reformatting comments related to `static_assert`s so that clang-format does not need two passes.
* Empty lines between #includes, to prevent clang-format from shuffling the order and thereby confusing MSVC 2015.
* git diff -U0 --no-color HEAD^ | python3 $HOME/clone/llvm-project/clang/tools/clang-format/clang-format-diff.py -p1 -style=file -i
