Fix fortran size_type_node parameter passing.

2019-05-22  Andrew Stubbs  <ams@codesourcery.com>

	gcc/fortran/
	* trans-stmt.c (gfc_trans_critical): Use size_type_node for
	gfor_fndecl_caf_lock and gfor_fndecl_caf_unlock calls.
	(gfc_trans_allocate): Use size_type_node for gfor_fndecl_caf_sync_all
	call.

From-SVN: r271512