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

[Priyanshu Kumar via cfe-commits]

Priyanshu3820 wrote:

hi @andykaylor, @philnik777's PR #165682 is removing the x86 sqrt builtins from Clang and replacing them with generic __builtin_elementwise_sqrt versions. I just wanted to clarify whether removing these builtins from clang also mean that we will be going to remove them from CIR too or are we going to maintain these supported builtins independently? 
Just wanna make sure I'm aligned with CIR's long-term direction.
@bcardosolopes would also appreciate your input on CIR's strategy here.

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