avr-arch.h (avr_mcu_t): Add flash_size member.

avr-arch.h (avr_mcu_t): Add flash_size member.

	* config/avr/avr-arch.h (avr_mcu_t): Add flash_size member.
	* config/avr/avr-devices.c(avr_mcu_types): Add flash size info.
	* config/avr/avr-mcu.def: Likewise.
	* config/avr/gen-avr-mmcu-specs.c (print_mcu): Remove hard-coded prefix
	check to find wrap-around value, instead use MCU flash size. For 8k flash
	devices, update link_pmem_wrap spec string to add --pmem-wrap-around=8k.
	* config/avr/specs.h: Remove link_pmem_wrap from LINK_RELAX_SPEC and
	add to linker specs (LINK_SPEC) directly.

From-SVN: r242966