pcc added a comment. FWIW, on aarch64 we decided to make `-fsanitize=shadow-call-stack` require the x18 reservation (instead of implying it) to try to avoid ABI mismatch problems. That is, it should be safe to mix and match code compiled with and without `-fsanitize=shadow-call-stack`. If we make `-fsanitize=shadow-call-stack` imply the x18 reservation, it makes it more likely that someone will accidentally build and link in incompatible code that does not reserve x18.
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