[libc-commits] [libc] [libc] Add limits.h header. (PR #78887)

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lntue wrote:

@petrhosek Do you mind checking if this header is correct for arm32 / riscv32 / baremetal?  Can I leave it to you to enable this header for those targets later?  Thanks,

https://github.com/llvm/llvm-project/pull/78887