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b7e2186f7d
Non-Escapable 'inout' arguments have a default self-dependency, regardless of
any other annotations. For example:
@_lifetime(dest: copy source)
/* DEFAULT: @_lifetime(dest: copy dest, copy source) */
func foo<T: ~Escapable>(dest: inout T, source: T)
An immortal lifetime specifier now suppresses that default. For example:
@_lifetime(dest: immortal, copy source)
/* DEFAULT: @_lifetime(dest: copy source) */
func foo<T: ~Escapable>(dest: inout T, source: T)
This is necessary because there is otherwise no other way to suppress the
default lifetime.
Fixes rdar://170016708 ([nonescapable] Support @_lifetime(immortal) to suppress
the usual inout default self-dependency)