[clang] [CIR][X86] Implement lowering for sqrt builtins (PR #169310)

[Priyanshu Kumar via cfe-commits]

Priyanshu3820 wrote:

just saw PR #165682 has been merged, which removes these x86 sqrt builtins from clang. I'm waiting for guidance on whether CIR should still implement these or follow upstream's direction with __builtin_elementwise_sqrt.

https://github.com/llvm/llvm-project/pull/169310