[clang] [flang] [llvm] Re-land: "[AArch64] Add ability to list extensions enabled for a target" (#95805) (PR #96795)

[Jonathan Thackray via cfe-commits]

================
@@ -343,7 +350,9 @@ bool isX18ReservedByDefault(const Triple &TT);
 // themselves, they are sequential (0, 1, 2, 3, ...).
 uint64_t getCpuSupportsMask(ArrayRef<StringRef> FeatureStrs);
 
-void PrintSupportedExtensions(StringMap<StringRef> DescMap);
+void PrintSupportedExtensions();
+
+void printEnabledExtensions(std::set<StringRef> EnabledFeatureNames);
----------------
jthackray wrote:

Can this be `std::set<StringRef>&` to avoid a (maybe large) copy?

https://github.com/llvm/llvm-project/pull/96795