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

[Jordan R AW via cfe-commits]

================
@@ -2817,7 +2817,7 @@ bool UnwindCursor<A, 
R>::setInfoForSigReturn(Registers_s390x &) {
   const pint_t pc = static_cast<pint_t>(this->getReg(UNW_REG_IP));
   // The PC might contain an invalid address if the unwind info is bad, so
   // directly accessing it could cause a SIGSEGV.
-  if (!isReadableAddr(pc) || !isReadableAddr(pc + 2))
+  if (!isReadableAddr(pc))
----------------
ajordanr-google wrote:

I think that's probably fine, as long as we aren't hitting a SIGSEGV.

https://github.com/llvm/llvm-project/pull/74791
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