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

[Deric C. via cfe-commits]

Icohedron wrote:

Would it be a good idea to remove `-disable-llvm-passes` from the RUN line in the `clang/test/CodeGenHLSL/BasicFeatures/ArrayOutputArguments.hlsl` test to ensure that the out and inout parameters are not eliminated by DSE?

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