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interpret: ensure that Place is never used for a different frame We store the address where the stack frame stores its `locals`. The idea is that even if we pop and push, or switch to a different thread with a larger number of frames, then the `locals` address will most likely change so we'll notice that problem. This is made possible by some recent changes by `@WaffleLapkin,` where we no longer use `Place` across things that change the number of stack frames. I made these debug assertions for now, just to make sure this can't cost us any perf. The first commit is unrelated but it's a one-line comment change so it didn't warrant a separate PR... r? `@oli-obk`