[clang] [llvm] [X86] AVX10_V2_AUX Implementation (PR #206888)

[Evgenii Kudriashov via cfe-commits]

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@@ -450,6 +450,8 @@ features cannot lower the translation-unit ABI level;
 
 #### X86 Support
 
+- Support ISA of `AVX10_V2_AUX` (`-mavx10v2aux`).
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e-kud wrote:

I find it a little bit weird that we have `avx10v2aux` when we don't have `avx10v1` nor `avx10v2` and have `avx10.2`. The only reason I see is to match cpuid. Do we have any flexibility here?

https://github.com/llvm/llvm-project/pull/206888