[clang-tools-extra] [clang] [clang-tidy] fix misc-const-correctnes false-positive for fold expressions (PR #78320)

[Piotr Zegar via cfe-commits]

PiotrZSL wrote:

@PiotrZSL I would say: fell free to merge it. It's not that it would break too much. In worst case we got around ~1 month to fix it on a branch (if someone would complain).

https://github.com/llvm/llvm-project/pull/78320