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Of the many dataflow analyses, `ConstAnalysis` is the only one that requires the analysis be mutabile when used with `ResultsVisitor`. It's needed because of the `ecx` field -- `ecx.intern_with_temp_alloc` is called during visiting and it takes `&mut self`. This commit changes `ConstAnalysis` to use interior mutability for the `ecx` field. This is a bit annoying for `ConstAnalysis`, but it will allow more immutability in `ResultsVisitor`, as seen in the next commit.