[llvm] [Arm64EC] Copy import descriptors to the EC Map (PR #84834)

[Jacek Caban via llvm-commits]

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@@ -704,6 +720,8 @@ static Expected<std::vector<unsigned>> getSymbols(SymbolicFile *Obj,
       if (Map == &SymMap->Map) {
         Ret.push_back(SymNames.tell());
         SymNames << Name << '\0';
+        if (CopyImportDescriptorToECMap && isImportDescriptor(Name))
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cjacek wrote:

You could check `SymMap->UseECMap` here instead of `CopyImportDescriptorToECMap`. When we're in `Map == &SymMap->Map` branch, we know we don't have EC object.

https://github.com/llvm/llvm-project/pull/84834