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

[Eli Friedman 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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efriedma-quic wrote:

If I'm following correctly, this unconditionally emits an EC map for arm64 targets, even if there aren't any non-native object files?  But that isn't consistent with the tests, so I think I must be missing something.

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