Optimizer: replace PredictableMemoryAccessOptimizations with a "mandatory" redundant load elimination pass#79186

Merged

eeckstein merged 8 commits intoswiftlang:mainfrom

eeckstein:remove-predictable-memopt

Feb 8, 2025

Commits on Feb 7, 2025

RedundantLoadElimination: optimize a load from a memory location which was written by copy_addr
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RedundantLoadElimination: ignore memory effects of begin_access
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RedundantLoadElimination: insert mark_dependence instructions for a removed load
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RedundantLoadElimination: add a "mandatory" redundant load elimination pass
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Optimizer: replace PredictableMemoryAccessOptimizations with MandatoryRedundantLoadElimination in the pass pipeline
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MandatoryPerformanceOptimizations: use `eliminateRedundantLoads` instead of `optimizeMemoryAccesses` to optimize redundant loads
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Remove the old (and now obsolete) PredictableMemoryAccessOptimizations pass
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tests: add a testfile for a predictable-memory-opt complexity problem.
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