Fix `MemCategorization` and `ExprUse` visitors for new solver#124859

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compiler-errors wants to merge 3 commits intorust-lang:masterfrom

compiler-errors:mem-cat

Commits on May 7, 2024

Assert that MemCategorizationVisitor actually errors when it bails ungracefully
compiler-errors
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Inline FnCtxt into MemCategorization and ExprUse
compiler-errors
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Structurally resolve in MemCategorization and ExprUse
compiler-errors
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