[clang] [clang][HLSL] Update DXIL/SPIRV hybird CodeGen tests to use temp var (PR #105930)

[Greg Roth via cfe-commits]

https://github.com/pow2clk commented:

Thanks @AmrDeveloper ! Really appreciate your initiative to take this on!

I think it might be helpful to use this excellent documentation resource https://github.com/llvm/llvm-project/blob/main/llvm/docs/CommandGuide/FileCheck.rst#filecheck-string-substitution-blocks



https://github.com/llvm/llvm-project/pull/105930