[clang] [Clang] Remove redundant check for scoped enums in shift operators (PR #152865)

[via cfe-commits]

Sirraide wrote:

> I prefer keeping my PRs atomic. All of my changes in that PR are necessary towards the primary goal of that PR, whereas this change wouldn't be. If I allowed myself to make refactors whenever I'm working on a feature it would introduce quite a bit of noise, which seems like a bad habit to have.

I mean, altenratively we could just wait until the other pr is merged and then merge this one afterwards; I just don’t like the idea of making a non-obvious change if there are no tests at all for it (unless we already have test that I missed but I couldn’t find any).

https://github.com/llvm/llvm-project/pull/152865