Backport 7937, BUG: Guard against buggy comparisons in generic quicksort. #7953
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#7937
Generic types may have buggy comparison operators in which case the
sentinal values in quicksort cannot be counted on to keep the pointers
from running off the ends of the array. The solution here is to
explicitly check that the pointers are in bounds when sorting generic
types.
Closes #7934.