[Foundation] searching in slices should index relative to the slice (4.1) #14852
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Searching in slices incorrectly passed the base index rather than the relative slice indexes. This change adjusts the indexing for searching in slices to be relative.
This addresses the following issues
https://bugs.swift.org/browse/SR-5209
rdar://problem/36261057
Tests were added to validate this failure has been addressed (kudos to the filer of the issue for providing a good unit test)