swift234

Revert "stdlib: add an experimental serialization API"

This reverts commit r25678, which breaks the build:

/Users/dgregor/Projects/Apple/swift/stdlib/serialization/MsgPack.swift:117:34: error: integer literal overflows when stored into 'Int'
    } else if utf8Bytes.count <= 0xffff_ffff {
                                 ^
/Users/dgregor/Projects/Apple/swift/stdlib/serialization/MsgPack.swift:139:34: error: integer literal overflows when stored into 'Int'
    } else if dataBytes.count <= 0xffff_ffff {
                                 ^
/Users/dgregor/Projects/Apple/swift/stdlib/serialization/MsgPack.swift:160:24: error: integer literal overflows when stored into 'Int'
    } else if count <= 0xffff_ffff {
                       ^
/Users/dgregor/Projects/Apple/swift/stdlib/serialization/MsgPack.swift:189:31: error: integer literal overflows when stored into 'Int'
    } else if mappingCount <= 0xffff_ffff {
                              ^
/Users/dgregor/Projects/Apple/swift/stdlib/serialization/MsgPack.swift:235:29: error: integer literal overflows when stored into 'Int'
    } else if data.count <= 0xffff_ffff {
                            ^

Swift SVN r25693