[clang] [llvm] [HLSL] Add WaveActiveBallot builtins and lower to DXIL / SPIR-V (PR #174638)

[Farzon Lotfi via cfe-commits]

farzonl wrote:

you are linking the wrong ticket should be this one: https://github.com/llvm/llvm-project/issues/99163

https://github.com/llvm/llvm-project/pull/174638