[clang] [CIR][X86] Add support for `cpuid`/`cpuidex` (PR #173197)

[Roberto Turrado Camblor via cfe-commits]

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+// RUN: %clang_cc1 -triple x86_64-unknown-linux -fms-extensions -Wno-implicit-function-declaration -fclangir -emit-cir -o %t.cir -Wall -Werror %s
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rturrado wrote:

Roger that. I'll leave this change as latest. So we focus on fixing the others before.

https://github.com/llvm/llvm-project/pull/173197