Use used's element type if it's available.

Author: AlexVlx

llvm/lib/Bitcode/Writer/BitcodeWriter.cpp

@@ -5501,8 +5501,9 @@ void llvm::embedBitcodeInModule(llvm::Module &M, llvm::MemoryBufferRef Buf,
   // Save llvm.compiler.used and remove it.
   SmallVector<Constant *, 2> UsedArray;
   SmallVector<GlobalValue *, 4> UsedGlobals;
-  Type *UsedElementType = PointerType::getUnqual(M.getContext());
   GlobalVariable *Used = collectUsedGlobalVariables(M, UsedGlobals, true);
+  Type *UsedElementType = Used ? Used->getValueType()->getArrayElementType()
+                               : PointerType::getUnqual(M.getContext());
   for (auto *GV : UsedGlobals) {
     if (GV->getName() != "llvm.embedded.module" &&
         GV->getName() != "llvm.cmdline")