Merging Arduino/Arduino upstream commits. #4209
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Minimal implementation of freeRTOS using the watchdog timer to trigger the scheduler. No impact on normal Arduino timer or interrupt usage. Sketches can be run as normal within setup() and loop(). FreeRTOS features (tasks, queues, semaphores, timers) are set up within the setup() function, and then are run with a higher priority than the loop() function which is effectively the idle task. Stack overflow is signalled by fast blinking LED. Malloc failure is indicated by slow blinking LED. Implemented with minimal changes to hooks.c, and main.cpp.
Faulty replica of the file in the ./cores/arduino directory.
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