[stable/20230725] SwiftCallingConv: Fix the splitVectorEntry function (#69953) #7712
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When splitting an entry into multiple entries, the indices of the split entries are a combination of the original split entry's and the number of elements we split that entry to.
Failure to do so resulted in non-sensical entries leading e.g to assertion failures in
getCoerceAndExpandTypes
and runtime failures in Swift programs.(cherry picked from commit 08e9c46)
rdar://116852924