Move the constructor for NVPTXFrameLowering into the implementation
file in preparation for the subtarget move.

llvm-svn: 211847
diff --git a/llvm/lib/Target/NVPTX/NVPTXFrameLowering.h b/llvm/lib/Target/NVPTX/NVPTXFrameLowering.h
index c372e83..56fb673 100644
--- a/llvm/lib/Target/NVPTX/NVPTXFrameLowering.h
+++ b/llvm/lib/Target/NVPTX/NVPTXFrameLowering.h
@@ -14,18 +14,15 @@
 #ifndef NVPTX_FRAMELOWERING_H
 #define NVPTX_FRAMELOWERING_H
 
-#include "NVPTXSubtarget.h"
 #include "llvm/Target/TargetFrameLowering.h"
 
 namespace llvm {
-
+class NVPTXSubtarget;
 class NVPTXFrameLowering : public TargetFrameLowering {
   bool is64bit;
 
 public:
-  explicit NVPTXFrameLowering(NVPTXSubtarget &STI)
-      : TargetFrameLowering(TargetFrameLowering::StackGrowsUp, 8, 0),
-        is64bit(STI.is64Bit()) {}
+  explicit NVPTXFrameLowering(NVPTXSubtarget &STI);
 
   bool hasFP(const MachineFunction &MF) const override;
   void emitPrologue(MachineFunction &MF) const override;