remove some usage of expr_list from read_rtx
gcc/ChangeLog:
2015-07-12 Trevor Saunders <tbsaunde+gcc@tbsaunde.org>
* gensupport.c (rtx_handle_directive): Adjust.
* read-rtl.c (apply_iterators): Take vector to add rtxs to
instead of expr list rtx.
(add_define_attr_for_define_subst): Likewise.
(add_define_subst_attr): Likewise.
(read_subst_mapping): Likewise.
(read_rtx): Likewise.
* rtl.h (read_rtx): Adjust.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@225833 138bc75d-0d04-0410-961f-82ee72b054a4