[libunwind] [clang] [llvm] [clang-tools-extra] [libunwind] Replace process_vm_readv with SYS_rt_sigprocmask (PR #74791)

[Jordan R AW via cfe-commits]

https://github.com/ajordanr-google edited 
https://github.com/llvm/llvm-project/pull/74791
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