Cache more MIR traversals#112288

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Noratrieb wants to merge 3 commits intorust-lang:masterfrom

Noratrieb:cache-mir-traversal-but-like-for-real

Commits on Jun 4, 2023

Use the postorder cache in `traversal::postorder`.
Noratrieb
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Use `traversal::{preorder, reachable_as_bitset}` from basic block cache
Noratrieb
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Commits on Jun 5, 2023

Revert "Use `traversal::{preorder, reachable_as_bitset}` from basic block cache"
Noratrieb
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