ptx: fix lint and compiler warnings

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126838 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/PTX/PTXTargetMachine.h b/lib/Target/PTX/PTXTargetMachine.h
index 2add713..a5dba53 100644
--- a/lib/Target/PTX/PTXTargetMachine.h
+++ b/lib/Target/PTX/PTXTargetMachine.h
@@ -26,10 +26,10 @@
 class PTXTargetMachine : public LLVMTargetMachine {
   private:
     const TargetData  DataLayout;
+    PTXSubtarget      Subtarget; // has to be initialized before FrameLowering
     PTXFrameLowering  FrameLowering;
     PTXInstrInfo      InstrInfo;
     PTXTargetLowering TLInfo;
-    PTXSubtarget      Subtarget;
 
   public:
     PTXTargetMachine(const Target &T, const std::string &TT,