* m68hc11-tdep.c (m68hc11_elf_make_msymbol_special): New function.

	* m68hc11-tdep.c (m68hc11_elf_make_msymbol_special): New function.
	(m68hc11_gdbarch_init): Install it in gdbarch.
	(MSYMBOL_SET_RTC, MSYMBOL_SET_RTI): New to set symbol specific flags.
	(MSYMBOL_IS_RTC, MSYMBOL_IS_RTI): New to test these flags.
	(MSYMBOL_SIZE): New for documentation.
	(insn_return_kind): Enum to specify how a function returns.
	(frame_extra_info): Cleanup and record the return mode.
	(gdbarch_tdep, USE_PAGE_REGISTER): New to control the use of page
	register in address computation.
	(m68hc11_get_return_insn): New to obtain the return instruction used
	by the function.
	(m68hc11_frame_init_saved_regs): Take into account the return
	instruction used by the function for far and interrupt functions.
	(m68hc11_init_extra_frame_info): Take into account page register.
	(m68hc11_frame_args_address): Adjust according to the return mode.
	(show_regs): Print page register only when it's used.