Use the triple to figure out if this is a darwin target, not
the subtarget.

llvm-svn: 219673
diff --git a/llvm/lib/Target/PowerPC/PPCMCInstLower.cpp b/llvm/lib/Target/PowerPC/PPCMCInstLower.cpp
index f4984cd..a67f8d0 100644
--- a/llvm/lib/Target/PowerPC/PPCMCInstLower.cpp
+++ b/llvm/lib/Target/PowerPC/PPCMCInstLower.cpp
@@ -40,7 +40,7 @@
   Mangler *Mang = AP.Mang;
   const DataLayout *DL = TM.getSubtargetImpl()->getDataLayout();
   MCContext &Ctx = AP.OutContext;
-  bool isDarwin = TM.getSubtarget<PPCSubtarget>().isDarwin();
+  bool isDarwin = Triple(TM.getTargetTriple()).isOSDarwin();
 
   SmallString<128> Name;
   StringRef Suffix;