Nate Chandler 06921cfe84 [SIL] Hollow out Builtin.copy, deprecate _copy. ...

The copy operator has been implemented and doesn't use it.  Remove
`Builtin.copy` and `_copy` as much as currently possible.

Source compatibility requires that `_copy` remain in the stdlib.  It is
deprecated here and just uses the copy operator.

Handling old swiftinterfaces requires that `Builtin.copy` be defined.
Redefine it here as a passthrough--SILGen machinery will produce the
necessary copy_addr.

rdar://127502242

2024-05-03 15:56:25 -07:00

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