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

[Daniil Kovalev via cfe-commits]

================
@@ -63,10 +63,11 @@ class DwarfInstructions {
                                   pint_t cfa, const RegisterLocation 
&savedReg);
 
   static pint_t getCFA(A &addressSpace, const PrologInfo &prolog,
-                       const R &registers) {
-    if (prolog.cfaRegister != 0)
-      return (pint_t)((sint_t)registers.getRegister((int)prolog.cfaRegister) +
-             prolog.cfaRegisterOffset);
+                       R &registers) {
----------------
kovdan01 wrote:

```suggestion
                       const R &registers) {
```

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