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

[Freddy Ye via cfe-commits]

================
@@ -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"
----------------
FreddyLeaf wrote:

Yes, the concern is from that gcc use `apxf` but not `egpr`. I don't think adding one more line like this is complete safe. I prefer to not touch APX firs and refine it in another PR, WDYT?
```
X86_FEATURE_COMPAT(EGPR,            "apxf",                   0)
```

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