Remove a wrong assert in the specializer and enable old Collection index functions in stdlib #13456
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In case of partial specialization, the replacement type of a substitution can be generic.
I couldn't find a small unit test for this bug fix. But it is tested by compiling the stdlib with the change in Collection.swift.
This change also enables the temporarily disabled deprecated Collection index functions, which are needed for source compatibility.
rdar://problem/36033852