[lld] [lld] Refactor storage of PAuth ABI core info (PR #141920)

[Peter Smith via llvm-commits]

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@@ -139,6 +139,19 @@ enum class GcsPolicy { Implicit, Never, Always };
 // For some options that resemble -z bti-report={none,warning,error}
 enum class ReportPolicy { None, Warning, Error };
 
+struct AArch64PauthAbiCoreInfo {
+  uint64_t platform;
+  uint64_t version;
+  bool isValid() const { return platform || version; }
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smithp35 wrote:

Could we add a comment:
```
Valid is defined as not the reserved declaration of incompatible with PAuthABI value.
```

https://github.com/llvm/llvm-project/pull/141920