[clang] [compiler-rt] [clang-tools-extra] [llvm] [X86] Support more ISAs to enable __builtin_cpu_supports (PR #79086)

[Phoebe Wang via cfe-commits]

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@@ -217,10 +217,11 @@ enum ProcessorFeatures {
   FEATURE_SM3,
   FEATURE_SHA512,
   FEATURE_SM4,
-  // FEATURE_APX_F,
-  FEATURE_USERMSR = 112,
-  // FEATURE_AVX10_1_256,
-  // FEATURE_AVX10_1_512,
+  //FIXME: gcc used string "apxf" instead of "egpr"
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phoebewang wrote:

The internal name is not important, so do not need a FIXME if we won't fix it.
I'm more concerning about the name in `(void)__builtin_cpu_supports("egpr");`
Does GCC use `egpr` too? Or we should change to "apxf"?

https://github.com/llvm/llvm-project/pull/79086