Fix OptimizeInstructions on unreachable GC RMWs#8485
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OptimizeInstructions lowers RMWs on non-shared GC data to sequences of non-atomic operations. It would previously do this even for expressions with unreachable children, which caused assertion failures when trying to make unreachable scratch locals. Bail out early and leave the optimization to DCE in this case.
kripken
approved these changes
Mar 18, 2026
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OptimizeInstructions lowers RMWs on non-shared GC data to sequences of non-atomic operations. It would previously do this even for expressions with unreachable children, which caused assertion failures when trying to make unreachable scratch locals. Bail out early and leave the optimization to DCE in this case.