[clang] [libcxx] [llvm] Triple::normalize: Use none as OS for XX-none-ABI (PR #89638)

[Fangrui Song via cfe-commits]

================
@@ -1151,6 +1151,13 @@ std::string Triple::normalize(StringRef Str) {
     }
   }
 
+  // For 3-component triples, the middle component is used to set Vendor;
----------------
MaskRay wrote:

Suggested comment

If "none" is in the middle component in a three-component triple, treat it as
the OS (Components[2]) instead of the vendor (Components[1]).


https://github.com/llvm/llvm-project/pull/89638
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