Auto merge of #53671 - RalfJung:miri-refactor, r=oli-obk
Miri engine cleanup * Unify the two maps in memory to store the allocation and its kind together. * Share the handling of statics between CTFE and miri: The miri engine always uses "lazy" `AllocType::Static` when encountering a static. Acessing that static invokes CTFE (no matter the machine). The machine only has any influence when writing to a static, which CTFE outright rejects (but miri makes a copy-on-write). * Add an `AllocId` to by-ref consts so miri can use them as operands without making copies. * Move responsibilities around for the `eval_fn_call` machine hook: The hook just has to find the MIR (or entirely take care of everything); pushing the new stack frame is taken care of by the miri engine. * Expose the intrinsics and lang items implemented by CTFE so miri does not have to reimplement them. * Allow Machine to hook into foreign statics (used by miri to get rid of some other hacks). * Clean up function calling. * Switch const sanity check to work on operands, not mplaces. * Move const_eval out of rustc_mir::interpret, to make sure that it does not access private implementation details. In particular, we can finally make `eval_operand` take `&self`. :-) Should be merged after https://github.com/rust-lang/rust/pull/53609, across which I will rebase.
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