[clang] [llvm] [SPIRV][HLSL] Add lowering of `rsqrt` to SPIRV (PR #95849)

[Farzon Lotfi via cfe-commits]

https://github.com/farzonl approved this pull request.

LGTM, code looka right, just a few more tests needed.

https://github.com/llvm/llvm-project/pull/95849