* avr-tdep.c: Include frame.h, frame-unwind.h, frame-base.h, and

* avr-tdep.c: Include frame.h, frame-unwind.h, frame-base.h, and
trad-frame.h.
(AVR_MAX_PROLOGUE_SIZE): Increase from 56 to 64.
(AVR_ARG1_REGNUM, AVR_ARGN_REGNUM): Define.
(AVR_RET1_REGNUM, AVR_RETN_REGNUM): Define.
(AVR_PROLOGUE_*): Enumerate prologue types.
(struct frame_extra_info): Remove.
(struct avr_unwind_cache): Define.
(avr_write_sp): Delete function.
(avr_read_fp): Ditto.
(avr_init_extra_frame_info): Ditto.
(avr_pop_frame): Ditto.
(avr_frame_saved_pc): Ditto.
(avr_saved_pc_after_call): Ditto.
(avr_push_return_address): Ditto.
(avr_frame_chain): Ditto.
(avr_store_struct_return): Ditto.
(avr_push_arguments): Ditto.
(avr_scan_prologue): Update comments. Changed to set up the info for
cache unwinding. Now returns end of prologue PC.
(avr_skip_prologue): Better handling of functions lacking a prologue
by using avr_scan_prologue.
(avr_scan_arg_moves): New function.
(avr_saved_regs_unwinder): Ditto.
(avr_frame_unwind_cache): Ditto.
(avr_unwind_pc): Ditto.
(avr_frame_this_id): Ditto.
(avr_frame_prev_register): Ditto.
(avr_frame_p): Ditto.
(avr_frame_base_address ): Ditto.
(avr_unwind_dummy_id): Ditto.
(avr_push_dummy_code): Ditto.
(push_stack_item): Ditto.
(pop_stack_item): Ditto.
(avr_push_dummy_call): Ditto.
(struct stack_item): Define.
(avr_frame_unwind): Declare structure.
(avr_frame_base): Ditto.
(avr_gdbarch_init): Remove calls to
set_gdbarch_deprecated_init_frame_pc,
set_gdbarch_deprecated_target_read_fp,
set_gdbarch_deprecated_dummy_write_sp,
set_gdbarch_deprecated_fp_regnum,
set_gdbarch_deprecated_push_arguments,
set_gdbarch_deprecated_push_return_address,
set_gdbarch_deprecated_pop_frame,
set_gdbarch_deprecated_store_struct_return,
set_gdbarch_deprecated_frame_init_saved_regs,
set_gdbarch_deprecated_init_extra_frame_info,
set_gdbarch_deprecated_frame_chain,
set_gdbarch_deprecated_frame_saved_pc,
set_gdbarch_deprecated_saved_pc_after_call.
Add calls to set_gdbarch_push_dummy_call,
set_gdbarch_push_dummy_code,
frame_unwind_append_predicate,
frame_base_set_default,
set_gdbarch_unwind_dummy_id,
set_gdbarch_unwind_pc.
Wrap a long line.