Support for multimasks in slot updates #2657
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As observed in engagement code, the compiler can sometimes use a multi-mask (in this case, specifically
1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111000000000000000000000000000000001111111111111111111111111111111111111111000000000000000000000000000000001111111111111111111111111111111111111111) to presumably save an&Intin consecutive updates of the same storage slot. Previously, the automated slot updates could only handle masks with a single batch of zeros.This PR generalises the slot updates to support multi-masks and adds an appropriate real-world test.