[llvm] [LLVM][Clang][AArch64] Implement AArch64 build attributes (PR #118771)

[Oliver Stannard via llvm-commits]

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@@ -107,25 +108,51 @@ class MCELFStreamer : public MCObjectStreamer {
     std::string StringValue;
   };
 
+  /// ELF object attributes subsection support
+  struct AttributeSubSection {
+    // [<uint32: subsection-length> NTBS: vendor-name <bytes: vendor-data>]*
+    StringRef Vendor;
+    // <uint8: optional> <uint8: parameter type> <attribute>*
+    unsigned IsMandatory; // SubsectionMandatory::REQUIRED (0),
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ostannard wrote:

You have added enums for these in ARMBuildAttributes.h, should they be used here?

https://github.com/llvm/llvm-project/pull/118771