[mlir][AliasAnalysis] Add opt-in query caching; use it in flang LICM Add a generic, opt-in query-caching capability to the mlir::AliasAnalysis aggregator. The aggregator gains a public RAII QueryCacheScope and private enable/disableQueryCaching() fan-out; the Concept gains enableQueryCaching()/ disableQueryCaching() and the Model forwards them to implementations that provide enableSourceCache()/disableSourceCache() (detected via llvm::is_detected) and no-ops otherwise, so existing implementations need no changes and transformation passes never name a concrete implementation. The FIR AliasAnalysis implements the hook by memoizing getSource(): getSource() becomes a thin wrapper over getSourceImpl() that consults a frozen-snapshot cache keyed on (value, flags) when caching is enabled. Flang's LICM enables caching for the duration of the pass via QueryCacheScope. This is sound because LICM only moves operations and getSource()'s position-dependent inputs are already frozen for the pass run by the AliasAnalysis's own dominance/scope caches, making caching observationally equivalent to no caching across the hoists. Assisted by Cursor
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