[patch,avr,applied] Use more C++ ish coding style.

[Georg-Johann Lay]

This is a no-op patch that uses some more C++ / C99
features if possible.

Johann

--

AVR: Use more C++ ish coding style.

gcc/
         * config/avr/avr.cc: Resolve ATTRIBUTE_UNUSED.
         Use bool in place of int for boolean logic (if possible).
         Move declarations to definitions (if possible).
         * config/avr/avr.md: Use C++ comments.  Fix some indentation 
glitches.
         * config/avr/avr-dimode.md: Same.
         * config/avr/constraints.md: Same.
         * config/avr/predicates.md: Same.
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