Sorry, only just realised that this one hadn't been approved as
part of the earlier series.
David Malcolm writes:
> gcc/ChangeLog:
> * genpreds.c (write_tm_constrs_h): Update for renaming of
> rtx_reader_ptr to md_reader_ptr.
> (write_tm_preds_h): Likewise.
> (write_insn_p
Link to earlier discussion:
https://gcc.gnu.org/ml/gcc-patches/2016-10/msg01690.html
This moves read_rtx and friends into rtx_reader, and splits
rtx_reader into two classes:
class md_reader: has responsibility for reading chars, managing
include files, top-level directives etc. It is the read-
