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

[Chandler Carruth via cfe-commits]

chandlerc wrote:

A long way from an expert on OpenCL, but it seems to not even have the concept of `long long`, and `long` is defined as a 64-bit type (and just optional for embedded stuff)?

https://registry.khronos.org/OpenCL/sdk/3.0/docs/man/html/scalarDataTypes.html

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