[llvm] [llvm-ar][Object][COFF] Compute UseECMap in computeMemberData. (PR #85230)

[Daniel Paoliello via llvm-commits]

================
@@ -795,23 +814,36 @@ computeMemberData(raw_ostream &StringTable, raw_ostream &SymNames,
       Entry.second = Entry.second > 1 ? 1 : 0;
   }
 
+  std::vector<std::unique_ptr<SymbolicFile>> SymFiles;
+
+  if (NeedSymbols != SymtabWritingMode::NoSymtab || isAIXBigArchive(Kind)) {
+    for (const NewArchiveMember &M : NewMembers) {
+      Expected<std::unique_ptr<SymbolicFile>> SymFileOrErr =
+          getSymbolicFile(M.Buf->getMemBufferRef(), Context);
+      if (!SymFileOrErr)
+        return createFileError(M.MemberName, SymFileOrErr.takeError());
+
+      // Use EC map if any member is ARM64 COFF file.
----------------
dpaoliello wrote:

Just a small clarification, since I had to check `isAnyArm64` to verify.
```suggestion
      // Use EC map if any member is ARM64 (including EC) COFF file.
```

https://github.com/llvm/llvm-project/pull/85230