Introduce rtx_insn subclass of rtx_def
gcc/
2014-08-18 David Malcolm <dmalcolm@redhat.com>
* coretypes.h (class rtx_insn): Add forward declaration.
* rtl.h: Include is-a.h.
(struct rtx_def): Add dummy "desc" and "tag" GTY options as a
workaround to ensure gengtype knows inheritance is occurring,
whilst continuing to use the pre-existing special-casing for
rtx_def.
(class rtx_insn): New subclass of rtx_def, adding the
invariant that we're dealing with something we can sanely use
INSN_UID, NEXT_INSN, PREV_INSN on.
(is_a_helper <rtx_insn *>::test): New.
(is_a_helper <const rtx_insn *>::test): New.
From-SVN: r214118