[SILGen] Handle struct projectedValue in struct property wrapper that has mutating setter

[stzn]

Resolves #81021

When the projectedValue is a struct within a struct property wrapper that has a mutating setter, and we use the property wrapper as a function parameter, the projectedValue becomes an Rvalue and does not have an address.

This issue does not occur if the property wrapper is a class, or if the projectedValue itself is a class.

Previously, we did not handle this case, which led to an assertion failure in the following code:

if (!address.isLValue()) { 
       // If it is a case described the above, `AccessKind` is `SGFAccessKind::ReadWrite`
        assert((AccessKind == SGFAccessKind::BorrowedObjectRead
                || AccessKind == SGFAccessKind::BorrowedAddressRead)
               && "non-borrow component requires an address base");

Since it is not an address, we could not treat it the same as the borrow cases.

Therefore, we needed to handle this scenario differently.

[drexin]

@swift-ci smoke test

[stzn]

@drexin
Thank you for running CI.
I don’t know if it’s right to ask you, but do you know who I should request to review this PR?

[drexin]

cc: @jckarter

[stzn]

@jckarter

Hi, what should I do next? Thank you.