[clang] [HLSL] Avoid putting ByVal on out and inout parameters (PR #150495)

[Joshua Batista via cfe-commits]

https://github.com/bob80905 commented:

Is it worth adding a test that would have added DeadOnReturn attribute, but now doesn't? Or is that covered by plenty of other tests currently?

https://github.com/llvm/llvm-project/pull/150495