[clang] [clang-format] Improve annotating templates (PR #165631)

[via cfe-commits]

owenca wrote:

> The static_assert hinted to be an expression and when the || was hit the fate was doomed. As far as I see we can never be sure if it's an expression or a template, but we can improve the situation for common cases.

It seems to me that `static_assert` is a declaration with a boolean expression as its first argument. IMO it would be safer to fix that instead.

https://github.com/llvm/llvm-project/pull/165631