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Auto merge of #136771 - scottmcm:poke-slice-iter-next, r=joboet
Simplify `slice::Iter::next` enough that it inlines
Inspired by this zulip conversation: <https://rust-lang.zulipchat.com/#narrow/channel/189540-t-compiler.2Fwg-mir-opt/topic/Feedback.20on.20a.20MIR.20optimization.20idea/near/498579990>
~~Draft for now because it needs #136735 to get the codegen tests to pass.~~
