[AsmPrinter] Don't compute Darwin triple on non-Darwin (llvm#97069)

There's no point in computing (=parsing) a triple on non-MachO/Darwin
platforms.

Author: aengelke

llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp

@@ -478,11 +478,13 @@ bool AsmPrinter::doInitialization(Module &M) {
   // use the directive, where it would need the same conditionalization
   // anyway.
   const Triple &Target = TM.getTargetTriple();
-  Triple TVT(M.getDarwinTargetVariantTriple());
-  OutStreamer->emitVersionForTarget(
-      Target, M.getSDKVersion(),
-      M.getDarwinTargetVariantTriple().empty() ? nullptr : &TVT,
-      M.getDarwinTargetVariantSDKVersion());
+  if (Target.isOSBinFormatMachO() && Target.isOSDarwin()) {
+    Triple TVT(M.getDarwinTargetVariantTriple());
+    OutStreamer->emitVersionForTarget(
+        Target, M.getSDKVersion(),
+        M.getDarwinTargetVariantTriple().empty() ? nullptr : &TVT,
+        M.getDarwinTargetVariantSDKVersion());
+  }
 
   // Allow the target to emit any magic that it wants at the start of the file.
   emitStartOfAsmFile(M);