WIP: Produce AIX-specific "target features" only for AIX

Author: hubert-reinterpretcast

clang/lib/Basic/Targets/PPC.cpp

@@ -609,13 +609,15 @@ bool PPCTargetInfo::initFeatureMap(
   // Privileged instructions are off by default.
   Features["privileged"] = false;
 
-  // The code generated by the -maix-small-local-[exec|dynamic]-tls option is
-  // turned off by default.
-  Features["aix-small-local-exec-tls"] = false;
-  Features["aix-small-local-dynamic-tls"] = false;
+  if (getTriple().isOSAIX()) {
+    // The code generated by the -maix-small-local-[exec|dynamic]-tls option is
+    // turned off by default.
+    Features["aix-small-local-exec-tls"] = false;
+    Features["aix-small-local-dynamic-tls"] = false;
 
-  // Turn off TLS model opt by default.
-  Features["aix-shared-lib-tls-model-opt"] = false;
+    // Turn off TLS model opt by default.
+    Features["aix-shared-lib-tls-model-opt"] = false;
+  }
 
   Features["spe"] = llvm::StringSwitch<bool>(CPU)
                         .Case("8548", true)