[CIR] Use SymbolTableCollection in LoweringPrepare's getCalledFunction (#195919) `LoweringPreparePass::lowerTrivialCopyCall` calls `getCalledFunction` once per `cir.call`, which used the static `mlir::SymbolTable::lookupNearestSymbolFrom` — that function does a linear scan of every operation in the module on each call, giving O(N × M) total for N calls in an M-operation module. The pass already maintains a `SymbolTableCollection` (used by `lowerStoreOfConstAggregate` and `lowerLocalInitOp`). Thread it through `getCalledFunction` and `lowerTrivialCopyCall` so the per-call lookup uses the cached hash-based path instead. Measured on Eigen's `bdcsvd.cpp` (heavy template instantiation): the 15.06% self-time hotspot from `getCalledFunction` is eliminated, contributing roughly another 2x compile-time speedup on the slowest tests. The cold path in `getOrCreateDtorFunc` (per-global, not per-call) is left on the static lookup with an explanatory comment to avoid threading `symbolTables` through `emitGlobalGuardedDtorRegion` and its callers. Companion to #195883 (`applyReplacements`) and #195916 (`CIRToLLVMCallOpLowering`) — same algorithmic anti-pattern in three different passes. Made with [Cursor](https://cursor.com) Co-authored-by: Cursor <cursoragent@cursor.com>
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