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Fix cycle error only occurring with -Zdump-mir fixes #134205 During mir dumping, we evaluate static items to render their allocations. If a static item refers to itself, its own MIR will have a reference to itself, so during mir dumping we end up evaluating the static again, causing us to try to build MIR again (mir dumping happens during MIR building). Thus I disabled evaluation of statics during MIR dumps in case the MIR body isn't far enough along yet to be able to be guaranteed cycle free.
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