* 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

tests/pybind11_tests.h

@@ -1,10 +1,15 @@
 #pragma once
+
+// This must be kept first for MSVC 2015.
+// Do not remove the empty line between the #includes.
 #include <pybind11/pybind11.h>
+
 #include <pybind11/eval.h>
 
 #if defined(_MSC_VER) && _MSC_VER < 1910
 // We get some really long type names here which causes MSVC 2015 to emit warnings
-#  pragma warning(disable: 4503) // warning C4503: decorated name length exceeded, name was truncated
+#    pragma warning(                                                                              \
+        disable : 4503) // warning C4503: decorated name length exceeded, name was truncated
 #endif
 
 namespace py = pybind11;