* interf.c (sim_open): Use revamped memory_read, which makes

	* interf.c (sim_open): Use revamped memory_read, which makes
	byte-swapping unnecessary.  Add -sparclite-board option for
	emulating RAM found on typical SPARClite boards.  Print
	error message for unrecognized option.
	* erc32.c: Change RAM address and size from constants to variables,
	to allow emulation of SPARClite board RAM.
	(fetch_bytes, store_bytes): New helper functions for revamped
	mememory_read and memory_write.
	(memory_read, memory_write): Rewrite to store bytes in target
	byte order instead of storing words in host byte order; this
	greatly simplifies support of little-endian programs.
	(get_mem_ptr): Remove unnecessary byte parameter.
	(sis_memory_write, sis_memory_read): Store words in target
	byte order instead of host byte order.
	(byte_swap_words): Remove, no longer needed.
	* sis.h ((byte_swap_words): Remove declaration, no longer needed.
	(memory_read): Add new sz parameter.
	* sis.c (run_sim): Use revamped memory_read, which makes
	byte-swapping unnecessary.
	* exec.c (dispatch_instruction): Use revamped memory_read, which
	makes byte-swapping and double-word fetching unnecessary.
	* func.c (sparclite_board): Declare new variable.
	(get_regi): Handle little-endian data.
	(bfd_load): Recognize little-endian SPARClite as having
	little-endian data.