[clang] [compiler-rt] [llvm] [X86] Hygon Processors Initial enablement (PR #187622)

[Simon Pilgrim via cfe-commits]

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@@ -445,6 +467,10 @@ constexpr ProcInfo Processors[] = {
   { {"znver4"}, CK_ZNVER4, FEATURE_AVX512VBMI2, FeaturesZNVER4, '\0', false },
   { {"znver5"}, CK_ZNVER5, FEATURE_AVX512VP2INTERSECT, FeaturesZNVER5, '\0', false },
   { {"znver6"}, CK_ZNVER6, FEATURE_AVX512FP16, FeaturesZNVER6, '\0', false },
+  // Hygon precessors.
+  { {"c86-4g-m4"}, CK_C86_4G_M4, FEATURE_AVX2, FeaturesC86_4G_M4 , '\0', false },
+  { {"c86-4g-m6"}, CK_C86_4G_M6, FEATURE_AVX512VBMI2, FeaturesC86_4G_M6 , '\0', false },
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RKSimon wrote:

Should this be FEATURE_AVX2? AFAICT M6 has the same feature set as M4.

https://github.com/llvm/llvm-project/pull/187622