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

[Jacek Caban via llvm-commits]

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@@ -678,6 +678,25 @@ static bool isECObject(object::SymbolicFile &Obj) {
   return false;
 }
 
+static bool useECMap(object::SymbolicFile &Obj) {
+  if (Obj.isCOFF())
+    return COFF::isAnyArm64(cast<COFFObjectFile>(&Obj)->getMachine());
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cjacek wrote:

We don't actually emit EC symbol map if there are no EC symbols, so I wrote it under assumption that it should be fine. Thinking about it again, with #84834, this patch causes copied import descriptor to populate and emit EC map. I will fix it, thanks.

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