[5.3] Allow initializing a wrapped property with a nonmutating setter #31460
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Cherry-pick #31161 into release/5.3, originally reviewed by @slavapestov
The title is achieved in 3 steps:
self
by value. It also introduces an additional load instruction for the setter patrial_apply because the setter signature still expects a value and we now have an address (because of (1)).self
value for a setter referenced on assign_by_wrapper because it will be deleted by lowering anyway.