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To remove compiler warning the valid core macro was modified to only check
that the core passed in was < # of total cores.  Unfortunately there are
parts of the FreeRTOS code where the passed in core # is -1.  The upstream
catches this and returns FALSE, but my hacked version returned TRUE.  This
caused interesting memory corruption errors and crashes when the
current task block[-1] was updated.

Undo the change and fix the 1 spot where a warning happens instead.

Undo the forced compiler -O0 for port.c, it was only masking the fault.