[llvm] [ConstantTime][LLVM] Add llvm.ct.select intrinsic with generic SelectionDAG lowering (PR #166702)

[Akshay K via llvm-commits]

kumarak wrote:

@arsenm 

> Missing LangRef changes

The LangRef changes are planned in the next PR (https://github.com/llvm/llvm-project/pull/166703). It will introduce support for Clang frontend intrinsics. 



https://github.com/llvm/llvm-project/pull/166702