libgcc.S: Gather related function in the same input section.

	
	* config/avr/libgcc.S: Gather related function in the
	same input section.
	__divmodsi4): Use XCALL/XJMP instead of rcall/rjmp for external
	references.
	(__udivmodqi4, __divmodqi4, __udivmodhi4, __divmodhi4,
	__udivmodsi4, __divmodsi4, __prologue_saves__,
	__epilogue_restores__, _exit, __tablejump2__, __tablejump__,
	__do_copy_data, __do_clear_bss, __do_global_ctors,
	__do_global_dtors, __tablejump_elpm__): Enclose in DEFUN/ENDF.

From-SVN: r177133