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This prevents useless spills to the same memory region from causing spilling to take too many passes to converge. Handling this at spilling time allows us to relax the generation of spill sections; specifically, multiple spills can now be generated per output section. This should be fairly benign for performance, and it would eventually allow linker scripts to express things like holes or minimum addresses for parts of output sections. The linker could then spill within an output section whenever address constraints are violated.