Without this, llvm would sometimes wrongly assume there's no indirect
accesses and the optimizations can lead to a runtime crash, by
optimizing away initializing options properly.
Resolves rdar://152548190
https://github.com/swiftlang/swift/pull/80821 added `@isolated(any)`
which is an ABI breaking change but since we are not planning to keep
this API around, let's use `@_silgen_name` to bring the old name back
for now.
Resolves: rdar://152178221
This change aligns implementation with the current SE-0472 proposal.
(cherry picked from commit c3c1b4fca0)
(cherry picked from commit 8c05636e28)
(cherry picked from commit 0598b8c9f4)
