3.12 Both cstore and cload are not treated as canonical storage operations in libyul #203
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Add tests for LoadResolver and EqualStoreEliminator to verify that cstore/cload confidential storage operations are optimized by the data-flow analysis passes, and that cross-domain independence between sstore/sload and cstore/cload is maintained. Includes a test verifying that cstore invalidates sload knowledge for the same key.
Add ConfidentialStorage as a third StoreLoadLocation in the DataFlowAnalyzer, enabling LoadResolver and EqualStoreEliminator to optimize cload/cstore the same way they handle sload/sstore. cstore/cload operate on an independent storage domain from sstore/sload, so they are tracked in a separate environment map. When cstore(k, v) is encountered, regular storage knowledge for key k is invalidated because a subsequent sload would HALT at runtime (the slot is now private). The reverse invalidation is not needed: sstore on a private slot always HALTs, so sstore can never affect confidential storage.
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