[clang] Mechanically port bulk of x86 builtins to TableGen (PR #120831)

[Phoebe Wang via cfe-commits]

phoebewang wrote:

> * Systematically using `Oi` instead of `LLi` for the type `long long int`. The `.def` file uses a mixture of `Oi` and `LLi`. I chose the shorter encoding.

The mixture use of `Oi` and `LLi` is a mess, but `Oi` has different meaning for OpenCL targets. I think we should not change `LLi` to `Oi`. I think a lot `Oi` can be replaced with `LLi`, but I cannot tell which are required with a quick look.

https://github.com/llvm/llvm-project/pull/120831