[clang] [llvm] [HLSL] Implement elementwise firstbitlow builtin (PR #116858)

[Sarah Spall via llvm-commits]

spall wrote:

I'd also update your description to mention fixing the vector > size 2 bug in FirstBitHigh as well, by making this code general purpose for both firstbitlow and firstbithigh.

https://github.com/llvm/llvm-project/pull/116858