AST: Remove incorrect optimization from ASTContext::getOpenedExistentialSignature() #72919
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…ialSignature() It is no longer true that the existential signature of `any P` is always just `<Self where Self: P>`, because `P` might be `~Copyable`, in which case `any P` is really `any P & Copyable`. Just remove the micro-optimization here, because if we're building an existential signature, we're likely going to be doing generic signature queries, and then we'll need a Requirement Machine anyway. This happened to manifest in the SIL optimizer when performing the concrete existential peephole with `any Sendable`, since Sendable is now ~Copyable. Fixes rdar://problem/126079282.
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It is no longer true that the existential signature of
any Pisalways just
<Self where Self: P>, becausePmight be~Copyable,in which case
any Pis reallyany P & Copyable.Just remove the micro-optimization here, because if we're building
an existential signature, we're likely going to be doing generic
signature queries, and then we'll need a Requirement Machine anyway.
This happened to manifest in the SIL optimizer when performing the
concrete existential peephole with
any Sendable, since Sendable isnow ~Copyable.
Fixes rdar://problem/126079282.