* config/avr/avr.md: Fix two 0x80000000 constants to make them
negative also on 64-bit hosts.
Default to -fno-reorder-blocks when optimizing for size.
* config/avr/avr-protos.h (avr_optimization_options): Declare.
* config/avr/avr.c (avr_optimization_options): New function.
* config/avr/avr.h (OPTIMIZATION_OPTIONS): New.
Optimize returning from simple functions.
* config/avr/avr-protos.h (avr_simple_epilogue): Declare.
* config/avr/avr.c (avr_simple_epilogue): New function.
* config/avr/avr.md (return): New insn.
From-SVN: r55378
