[llvm] [RISCV] Add support for getHostCPUFeatures using hwprobe (PR #94352)

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

> Do you offer an alternative/default implementation when __NR_riscv_hwprobe is not available, e.g., in docker containers?

Is `/proc/cpuinfo` available in containers? If so, I can provide a fallback implementation by reading the `isa` field from this file.



https://github.com/llvm/llvm-project/pull/94352