Submitted by Jan Waclawek:
Document issues around compiler optimizations and code reordering
* doc/api/optimize.dox: New file.
* doc/api/doxygen.config.in: Add optimize.dox.
* include/avr/cpufunc.h (_MemoryBarrier): xref to optim_code_reorder
* include/avr/interrupt.h: (Ditto.)
* include/util/atomic.h: (Ditto.)
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