CapturePropagation: handle existential keypaths #79816
Merged
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Handle open_existential_ref instructions which cast keypath instructions before they are passed to a partial_apply. In Swift language mode 6 keypaths are existentials (e.g.
any WritableKeyPath<Str, Int> & Sendable
) and we need to deal with that in CapturePropagation.rdar://141370412
This is a follow-up of #78160