[lld] [llvm] [lld][AArch64][Build Attributes] Add support for converting AArch64 Build Attributes to GNU Properties (PR #131990)

[via llvm-commits]

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@@ -207,6 +209,51 @@ static void updateSupportedARMFeatures(Ctx &ctx,
   ctx.arg.armHasThumb2ISA |= thumb && *thumb >= ARMBuildAttrs::AllowThumb32;
 }
 
+struct KnownAArch64BuildAttrSubsections {
+  struct PauthSubSection {
+    unsigned tagPlatform = 0;
+    unsigned tagSchema = 0;
+  } pauth;
+  struct FAndBSubSection {
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sivan-shani wrote:

P.s. for the same reason I would prefer `KnownAArch64BuildAttrSubsections` over `AArch64BuildAttrSubsections` even if at present the `Known` part does not seems to add much. But there it is only name, here is a possible future task that will take someone to context switch into it, understand the materia, find a solution, etc. Let me know what do you thing.

https://github.com/llvm/llvm-project/pull/131990