[clang] [HLSL] Emit lifetime.start before copy-in for inout parameters (PR #191917)

[Alexandre Isoard via cfe-commits]

isoard-amd wrote:

This change is necessary before #191909 can be submitted (as it will cause some test-cases to "simplify" to `undef`, aka. expose the bug introduced by #101083 ).

https://github.com/llvm/llvm-project/pull/191917