avr.h (machine_function): Add 'is_OS_main' field.
* config/avr/avr.h (machine_function): Add 'is_OS_main' field. * config/avr/avr.c (avr_OS_main_function_p): Add new function. (avr_attribute_table): Add 'OS_main' function attribute. (avr_regs_to_save, expand_prologue, expand_epilogue): Handle functions with 'OS_main' attribute. From-SVN: r135681
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