[5.0][stdlib] _HashTable.copyContents: Fix out of bounds access #20771
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(Cherry-picked from #20762, reviewed by @aschwaighofer)
There is a distressing typo in _HashTable that causes bitmap copy operations to copy up to 64 times more memory than necessary. This sometimes leads to the copy operation overrunning the tail-allocated buffer.
https://bugs.swift.org/browse/SR-9348