Index: llvm/lib/LTO/LTO.cpp
===================================================================
--- llvm/lib/LTO/LTO.cpp
+++ llvm/lib/LTO/LTO.cpp
@@ -857,6 +857,8 @@
   for (GlobalValue *GV : Mod.Keep) {
     if (LivenessFromIndex && !ThinLTO.CombinedIndex.isGUIDLive(GV->getGUID())) {
       if (Function *F = dyn_cast<Function>(GV)) {
+        if (Error Err = F->materialize())
+          return std::move(Err);
         OptimizationRemarkEmitter ORE(F, nullptr);
         ORE.emit(OptimizationRemark(DEBUG_TYPE, "deadfunction", F)
                  << ore::NV("Function", F)