[fir][aa] Add opt-in cache for use by fir `AliasAnalysis` clients (#221973) Adds `AliasAnalysisRecursiveEffectsCache`, an opt-in cache that memoizes per-operation read/write summaries so that `getModRef` on an operation with `HasRecursiveMemoryEffects` does not re-walk its nested regions on every query. This is independent of the `getSource()` memoization added separately: that one is keyed on (value, flags) and answers "what memory does this value refer to", while this one is keyed on the operation and answers "what does this operation and everything nested in it read and write". LICM enables both, since it only hoists pure-read ops and so invalidates neither.
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