Auto merge of #127421 - cjgillot:cache-iter, r=fmease

Cache hir_owner_nodes in ParentHirIterator.

Lint level computation may traverse deep HIR trees using that iterator. This calls `hir_owner_nodes` many times for the same HIR owner, which is wasterful.

This PR caches the value to allow a more efficient iteration scheme.

r? ghost for perf
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bors 2024-07-08 01:19:32 +00:00
commit 73aab1e343

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