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[illumos] enable SIGSEGV handler to detect stack overflows Use the same code as Solaris. I couldn't find any tests regarding this, but I did test a stage0 build against my stack-exhaust-test binary [1]. Before: ``` running with use_stacker = No, new_thread = false, make_large_local = false zsh: segmentation fault (core dumped) cargo run ``` After: ``` running with use_stacker = No, new_thread = false, make_large_local = false thread 'main' has overflowed its stack fatal runtime error: stack overflow zsh: IOT instruction (core dumped) cargo +stage0 run ``` Fixes #128568. [1] https://github.com/sunshowers/stack-exhaust-test/