[clang] [clang][X86] Add __cpuidex function to cpuid.h (PR #97785)

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:warning: C/C++ code formatter, clang-format found issues in your code. :warning:

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``````````bash
git-clang-format --diff 9e211744b82a72e08c137f75b1c671713e2891af 38325cbf03e5013056dfc1b7939ec7c9738f9fe2 -- clang/test/Headers/__cpuidex_conflict.c clang/lib/Headers/cpuid.h clang/test/Headers/cpuid.c
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Headers/cpuid.h b/clang/lib/Headers/cpuid.h
index cd55410cda..82d995f1b9 100644
--- a/clang/lib/Headers/cpuid.h
+++ b/clang/lib/Headers/cpuid.h
@@ -342,8 +342,7 @@ static __inline int __get_cpuid_count (unsigned int __leaf,
 // In some configurations, __cpuidex is defined as a builtin (primarily
 // -fms-extensions) which will conflict with the __cpuidex definition below.
 #if !(__has_builtin(__cpuidex))
-static __inline void __cpuidex (int __cpu_info[4], int __leaf, int __subleaf)
-{
+static __inline void __cpuidex(int __cpu_info[4], int __leaf, int __subleaf) {
   __cpuid_count(__leaf, __subleaf, __cpu_info[0], __cpu_info[1], __cpu_info[2],
                 __cpu_info[3]);
 }

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https://github.com/llvm/llvm-project/pull/97785