[nfc]For InstrProfData.inc, clang-format functions and opt-out of formatting on the rest (#82057)

Without this, each time `InstrProfData.inc` is modified (like in
https://github.com/llvm/llvm-project/pull/81691), pre-commit CI
clang-format aggressively formats many lines in an unreadable way. Pull
request with red pre-commit checks are usually frowned upon.

* Use `// clang-format:<reason>` instead of `/* clang-format */`. The
former
[allows](https://github.com/llvm/llvm-project/blob/563ef306017a47d387f1c36dd562b172c1ad0626/clang/lib/Format/Format.cpp#L4108-L4113)
specifying a reason but the latter is
[not](https://github.com/llvm/llvm-project/blob/563ef306017a47d387f1c36dd562b172c1ad0626/clang/lib/Format/Format.cpp#L4105-L4106).
- Filed https://github.com/llvm/llvm-project/issues/82426 to track the
issue in clang-format.