Rollup merge of #71005 - jonas-schievink:no-place-like-return, r=oli-obk

Reading from the return place is fine

Const eval thinks that reading from local `_0` is UB, but it isn't. `_0` is just a normal local like any other, and codegen handles it that way too. The only special thing is that the `Return` terminator will read from it.

I've hit these errors while working on an NRVO pass that can merge other locals with `_0` in https://github.com/rust-lang/rust/pull/71003.

r? @oli-obk

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