Arnold Schwaighofer 1386af04a2 Revert "stdlib: Add custom .first to Array" ...

This reverts commit 3e932c075d.

The compiler does not support @_alwaysEmitIntoClient properties
specially wrt property descriptors. The revert commit would introduce an
ABI incompatability when a keypath to Array.first is formed:

    let greetings = ["hello", "hola"]
    let count = greetings[keyPath: \[String].first?.count]

Runmning on an older runtime would lead to linker errors against $sSa5firstxSgvpMV
the property descriptor for Array.first.

rdar://58484319

2020-01-13 13:07:00 -08:00

5.9 KiB

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