[compiler-rt] [libcxxabi] [libunwind] [runtimes][PAC] Harden unwinding when possible (#138571) (PR #143230)

[Oliver Hunt via llvm-commits]

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@@ -557,7 +596,19 @@ set_registers(_Unwind_Exception* unwind_exception, _Unwind_Context* context,
                 reinterpret_cast<uintptr_t>(unwind_exception));
   _Unwind_SetGR(context, __builtin_eh_return_data_regno(1),
                 static_cast<uintptr_t>(results.ttypeIndex));
+#if defined(__APPLE__) && __has_feature(ptrauth_qualifier)
+  auto stack_pointer = _Unwind_GetGR(context, UNW_REG_SP);
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ojhunt wrote:

yeah, I spent a bunch of time trying to get the spellings more consistent but I really wasn't sure :-/

https://github.com/llvm/llvm-project/pull/143230