[clang] [clang][clangIR]: Implement builtin x86 arch cpu detection. (PR #212143)

[Lucas Ribeiro via cfe-commits]

lucaslive974 wrote:

No worries at all about the PR, these things happen! Thanks for the apology and for pointing me to this new issue. I'll be happy to take a look at #213024. I give it a shoot and reach out if I get stuck with the no_proto propagation or the tests. Thanks for the support!

https://github.com/llvm/llvm-project/pull/212143