[libunwind] [llvm] [AArch64][Libunwind] Add Support for FEAT_PAuthLR DWARF Instruction (PR #112171)

[Jonathan Thackray via cfe-commits]

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@@ -799,6 +802,24 @@ bool CFI_Parser<A>::parseFDEInstructions(A &addressSpace,
         }
         break;
 
+#if defined(_LIBUNWIND_TARGET_AARCH64)
+      case DW_CFA_AARCH64_negate_ra_state_with_pc: {
+        int64_t value =
+            results->savedRegisters[UNW_AARCH64_RA_SIGN_STATE].value ^ 0x3;
+        results->setRegisterValue(UNW_AARCH64_RA_SIGN_STATE, value,
+                                  initialState);
+        // When calucating the value of the PC, it is assumed that the CFI
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jthackray wrote:

nit: calculating

https://github.com/llvm/llvm-project/pull/112171