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

[Oliver Hunt via llvm-commits]

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@@ -694,7 +705,12 @@ DEFINE_LIBUNWIND_FUNCTION(__libunwind_Registers_arm64_jumpto)
   gcspushm x30
 Lnogcs:
 #endif
+
+#if __has_feature(ptrauth_calls)
+  retab
+#else
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ojhunt wrote:

see earlier comment - do we want to just adopt a single flag instead of the current mix of ptrauth_calls and ptrauth_returns ?

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