Index: llvm/lib/Transforms/Utils/CloneModule.cpp
===================================================================
--- llvm/lib/Transforms/Utils/CloneModule.cpp
+++ llvm/lib/Transforms/Utils/CloneModule.cpp
@@ -109,6 +109,15 @@
     VMap[&I] = GA;
   }
 
+  for (const GlobalIFunc &I : M.ifuncs()) {
+    // Defer setting the resolver function until after functions are cloned.
+    auto *GI =
+        GlobalIFunc::create(I.getValueType(), I.getAddressSpace(),
+                            I.getLinkage(), I.getName(), nullptr, New.get());
+    GI->copyAttributesFrom(&I);
+    VMap[&I] = GI;
+  }
+
   // Now that all of the things that global variable initializer can refer to
   // have been created, loop through and copy the global variable referrers
   // over...  We also set the attributes on the global now.
@@ -184,6 +193,12 @@
       GA->setAliasee(MapValue(C, VMap));
   }
 
+  for (const GlobalIFunc &I : M.ifuncs()) {
+    GlobalIFunc *GI = cast<GlobalIFunc>(VMap[&I]);
+    if (const Constant *Resolver = I.getResolver())
+      GI->setResolver(MapValue(Resolver, VMap));
+  }
+
   // And named metadata....
   for (const NamedMDNode &NMD : M.named_metadata()) {
     NamedMDNode *NewNMD = New->getOrInsertNamedMetadata(NMD.getName());