h8300.c (h8300_current_function_monitor_function_p): New function.

	* h8300/h8300.c (h8300_current_function_monitor_function_p):
	New function. Added to check monitor functions. 
	(h8300_option_override): Modified to generate error/warning 
	messages for invalid combinations of different command line 
	options.
	* h8300/h8300.md: Generate 'rte' for monitor functions. Do not
	save EXR on stack for monitor function in case of H8S target 
	when "-mno-exr" is passed.
	* h8300/h8300-protos.h 
	(h8300_current_function_monitor_function_p): Add prototype.
	* doc/invoke.texi: Document H8S options.

From-SVN: r186109