[clang] [HLSL] standardize builtin unit tests (PR #83340)

[Farzon Lotfi via cfe-commits]

farzonl wrote:

> > Do we have the suggestions that this is responding to written down somewhere? I think it would be useful to have those guidelines for anyone who might want to contribute HLSL tests. At any rate, I'd like to know the ones that this is in response to.
> 
> Following on from this, how would someone reproduce the clang formatting you got here? It sounds like you had to explicitly turn off comment reflowing to make it work as intended?

@damyanp that is correct I added `ReflowComments: false` to clang/test/.clang-format and I removed `DisableFormat` Then just ran  clang-format on the subset of tests I was already touching.

https://github.com/llvm/llvm-project/pull/83340