[arm] -fstack-clash-protection support
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backend:ARM
enhancement
- Dominant language
- LLVM
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Description
forked from #40148. We have to implement per-backed support for `-fstack-clash-protection`; we have it for [a few architectures](https://github.com/llvm/llvm-project/issues/40148#issuecomment-4263095453), but FWICT, not for 32b ARM, which might be nice to have.
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