Include what you use in NVPTX.h

Other files were not relying on these transitive includes, so I'm
submitting this change separately.

llvm-svn: 362403

llvm/lib/Target/NVPTX/NVPTX.h

@@ -14,13 +14,8 @@
 #ifndef LLVM_LIB_TARGET_NVPTX_NVPTX_H
 #define LLVM_LIB_TARGET_NVPTX_NVPTX_H
 
-#include "llvm/ADT/StringMap.h"
-#include "llvm/IR/Module.h"
-#include "llvm/IR/Value.h"
-#include "llvm/Support/ErrorHandling.h"
-#include "llvm/Target/TargetMachine.h"
-#include <cassert>
-#include <iosfwd>
+#include "llvm/Pass.h"
+#include "llvm/Support/CodeGen.h"
 
 namespace llvm {
 class NVPTXTargetMachine;