[Sema] Fix optional chaining behavior with postfix operators #80303
+111
−46
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Postfix operators can further be chained within an optional binding chain, so we need to make sure they're handled in
getMemberChainSubExpr
. Unresolved member chains still don't allow them, so we need to add a newkind
parameter to differentiate the behavior here.rdar://147826988
Resolves #80265