[stdlib] Fix the String.decodeCString for UTF16 and UTF32
#2713
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Resolves [SR-1578](https://bugs.swift.org/browse/SR-1578] Essentially the problem was that `strlen` is not the right way of obtaining a length of anything but null-terminated UTF-8 sequence of characters. Other encodings require alternative mechanisms.
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@swift-ci Please test |
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String.decodeCSstringmethod was introduced while we were reviewing the Standard Library and applying the new API naming guidelines to it, and it's implementation has always contained this bug.String.decodeCStringfor UTF16 and UTF32 #2681)rdar://problem/26423201