[Sema] Diagnose ambiguous for RValue to LValue - pick overload choice that is settable #74236
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With multiple overload choices, TreatRValueAsLValue used to just pick the first solution. We get better diagnostics if we pick a solution where the chosen VarDecl is settable, if there is one.
I.e. if you conform to two protocols with same-named property, one of which is
{get}and the other is{get set}and both possibilities end up with the same fix in the same location, it isn't much help to use the "it's a get-only property" choice.Resolves #46265