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e5371eded9
According to the conversation [here](https://github.com/llvm/llvm-project/pull/119414#issuecomment-2536495859), some platforms don't enable `__arm_cpu_features` with a global constructor, but rather do so lazily when called from the FMV resolver. PR #119414 removed the CMake guard to check to see if the targetted platform is baremetal or supports sys/auxv. Without this check, the routines rely on `__arm_cpu_features` being initialised when they may not be, depending on the platform. This PR simply avoids building the SME routines for those platforms for now.