Add generating function declaration for PTX


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118398 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/PTX/PTXMachineFunctionInfo.h b/lib/Target/PTX/PTXMachineFunctionInfo.h
index 0a860b5..6fbad5f 100644
--- a/lib/Target/PTX/PTXMachineFunctionInfo.h
+++ b/lib/Target/PTX/PTXMachineFunctionInfo.h
@@ -56,6 +56,7 @@
   typedef std::vector<unsigned>::const_iterator reg_iterator;
 
   bool argRegEmpty() const { return reg_arg.empty(); }
+  int getNumArg() const { return reg_arg.size(); }
   reg_iterator argRegBegin() const { return reg_arg.begin(); }
   reg_iterator argRegEnd()   const { return reg_arg.end(); }