[clang] [clang] Fix name conflict with `sys/mac.h` on AIX (PR #88644)

[Joseph Huber via cfe-commits]

================
@@ -50,6 +50,11 @@ const char *CudaVersionToString(CudaVersion V);
 // Input is "Major.Minor"
 CudaVersion CudaStringToVersion(const llvm::Twine &S);
 
+// We have a name conflict with sys/mac.h on AIX
+#ifdef _AIX
+#undef SM_32
+#endif
+
----------------
jhuber6 wrote:

```suggestion
// We have a name conflict with sys/mac.h on AIX
#ifdef SM_32
#undef SM_32
#endif
```

https://github.com/llvm/llvm-project/pull/88644