Auto merge of #37764 - nnethercote:shrink-scope_auxiliary, r=nikomatsakis
Remove `scope_auxiliary`. `scope_auxiliary` is a big part of the high memory usage in #36799. It's only used for MIR dumping. I have taken a hubristic approach: I have assumed that particular use is unimportant and removed `scope_auxiliary` and related things. This reduces peak RSS by ~10% for a cut-down version of the program in #36799. If that assumption is wrong perhaps we can avoid building `scope_auxiliary` unless MIR dumping is enabled.
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