[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());
+
+  if (Obj.isCOFFImportFile())
+    return COFF::isAnyArm64(cast<COFFImportFile>(&Obj)->getMachine());
+
+  if (Obj.isIR()) {
+    Expected<std::string> TripleStr =
+        getBitcodeTargetTriple(Obj.getMemoryBufferRef());
+    if (!TripleStr)
+      return false;
+    Triple T(*TripleStr);
+    return T.getArch() == Triple::aarch64;
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cjacek wrote:

The whole check is done only for K_COFF format, but sure, it would be better to be more strict here. I will change it.

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