Use C call convention's arg packer in cabi_wrap_function

Author: shwina

numba_cuda/numba/cuda/compiler.py

@@ -333,7 +333,7 @@ def cabi_wrap_function(context, lib, fndesc, wrapper_function_name,
     wrapfn = ir.Function(wrapper_module, wrapfnty, wrapper_function_name)
     builder = ir.IRBuilder(wrapfn.append_basic_block(''))
 
-    arginfo = context.get_arg_packer(argtypes)
+    arginfo = c_call_conv._get_arg_packer(argtypes)
     callargs = arginfo.from_arguments(builder, wrapfn.args)
     # We get (status, return_value), but we ignore the status since we
     # can't propagate it through the C ABI anyway

numba_cuda/numba/cuda/target.py

@@ -365,4 +365,4 @@ def get_return_type(self, ty):
         return self.context.data_model_manager[ty].get_return_type()
 
     def _get_arg_packer(self, fe_args):
-        return CUDACABIArgPacker(self.data_model_manager, fe_args)
+        return CUDACABIArgPacker(self.context.data_model_manager, fe_args)