[Patch,AVR] Tidy up builtins expansion

[Georg-Johann Lay]

This patch merges the tree functions that handled builtins with
one, two, three arguments to one function.

Code is clearer and smaller if the arguments are handled in a loop
instead of hand-unrolled loops as with the old functions.

Ok for trunk?

Johann

	* config/avr/avr.c (avr_default_expand_builtin): New function.
	(avr_expand_builtin): Use it.
	(avr_expand_unop_builtin): Remove.
	(avr_expand_binop_builtin): Remove.
	(avr_expand_triop_builtin): Remove.

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