diff --git a/llvm/lib/Transforms/IPO/ThinLTOBitcodeWriter.cpp b/llvm/lib/Transforms/IPO/ThinLTOBitcodeWriter.cpp
--- a/llvm/lib/Transforms/IPO/ThinLTOBitcodeWriter.cpp
+++ b/llvm/lib/Transforms/IPO/ThinLTOBitcodeWriter.cpp
@@ -195,6 +195,29 @@
     forEachVirtualFunction(cast<Constant>(Op), Fn);
 }
 
+// Clone any @llvm[.compiler].used over to the new module and append
+// values whose defs were cloned into that module.
+static void cloneUsedGlobalVariables(const Module &SrcM, Module &DestM,
+                                     bool CompilerUsed) {
+  SmallPtrSet<GlobalValue *, 8> Used;
+  SmallPtrSet<GlobalValue *, 8> NewUsed;
+  // First collect those in the llvm[.compiler].used set.
+  collectUsedGlobalVariables(SrcM, Used, CompilerUsed);
+  // Next build a set of the equivalent values defined in DestM.
+  for (auto *V : Used) {
+    auto *GV = DestM.getNamedValue(V->getName());
+    if (GV && !GV->isDeclaration())
+      NewUsed.insert(GV);
+  }
+  // Finally, add them to a llvm[.compiler].used variable in DestM.
+  if (CompilerUsed)
+    appendToCompilerUsed(
+        DestM, std::vector<GlobalValue *>(NewUsed.begin(), NewUsed.end()));
+  else
+    appendToUsed(DestM,
+                 std::vector<GlobalValue *>(NewUsed.begin(), NewUsed.end()));
+}
+
 // If it's possible to split M into regular and thin LTO parts, do so and write
 // a multi-module bitcode file with the two parts to OS. Otherwise, write only a
 // regular LTO bitcode file to OS.
@@ -275,11 +298,6 @@
   ValueToValueMapTy VMap;
   std::unique_ptr<Module> MergedM(
       CloneModule(M, VMap, [&](const GlobalValue *GV) -> bool {
-        // Clone any llvm.*used globals to ensure the included values are
-        // not deleted.
-        if (GV->getName() == "llvm.used" ||
-            GV->getName() == "llvm.compiler.used")
-          return true;
         if (const auto *C = GV->getComdat())
           if (MergedMComdats.count(C))
             return true;
@@ -292,6 +310,11 @@
   StripDebugInfo(*MergedM);
   MergedM->setModuleInlineAsm("");
 
+  // Clone any llvm.*used globals to ensure the included values are
+  // not deleted.
+  cloneUsedGlobalVariables(M, *MergedM, /*CompilerUsed*/ false);
+  cloneUsedGlobalVariables(M, *MergedM, /*CompilerUsed*/ true);
+
   for (Function &F : *MergedM)
     if (!F.isDeclaration()) {
       // Reset the linkage of all functions eligible for virtual constant
diff --git a/llvm/lib/Transforms/Utils/ModuleUtils.cpp b/llvm/lib/Transforms/Utils/ModuleUtils.cpp
--- a/llvm/lib/Transforms/Utils/ModuleUtils.cpp
+++ b/llvm/lib/Transforms/Utils/ModuleUtils.cpp
@@ -76,11 +76,13 @@
   SmallPtrSet<Constant *, 16> InitAsSet;
   SmallVector<Constant *, 16> Init;
   if (GV) {
-    auto *CA = cast<ConstantArray>(GV->getInitializer());
-    for (auto &Op : CA->operands()) {
-      Constant *C = cast_or_null<Constant>(Op);
-      if (InitAsSet.insert(C).second)
-        Init.push_back(C);
+    if (GV->hasInitializer()) {
+      auto *CA = cast<ConstantArray>(GV->getInitializer());
+      for (auto &Op : CA->operands()) {
+        Constant *C = cast_or_null<Constant>(Op);
+        if (InitAsSet.insert(C).second)
+          Init.push_back(C);
+      }
     }
     GV->eraseFromParent();
   }
diff --git a/llvm/test/Transforms/ThinLTOBitcodeWriter/split-used.ll b/llvm/test/Transforms/ThinLTOBitcodeWriter/split-used.ll
new file mode 100644
--- /dev/null
+++ b/llvm/test/Transforms/ThinLTOBitcodeWriter/split-used.ll
@@ -0,0 +1,30 @@
+; Test to ensure that @llvm[.compiler].used is cloned to the split module for
+; any globals whose defs were cloned to that module.
+
+; RUN: opt -thinlto-bc -thinlto-split-lto-unit -o %t %s
+; RUN: llvm-modextract -b -n 0 -o %t0.bc %t
+; RUN: llvm-modextract -b -n 1 -o %t1.bc %t
+; RUN: llvm-dis -o - %t0.bc | FileCheck --check-prefix=M0 %s
+; RUN: llvm-dis -o - %t1.bc | FileCheck --check-prefix=M1 %s
+
+; M0: @g1 = external global i8
+; M0: @g2 = external global i8
+; M0: @g3 = global i8 42
+; M0: @g4 = global i8 42
+; M1: @g1 = global i8 42, !type !0
+; M1: @g2 = global i8 42, !type !0
+; M1-NOT: @g
+@g1 = global i8 42, !type !0
+@g2 = global i8 42, !type !0
+@g3 = global i8 42
+@g4 = global i8 42
+
+; M0: @llvm.used = appending global [2 x i8*] [i8* @g1, i8* @g3]
+; M0: @llvm.compiler.used = appending global [2 x i8*] [i8* @g2, i8* @g4]
+; M1: @llvm.used = appending global [1 x i8*] [i8* @g1]
+; M1: @llvm.compiler.used = appending global [1 x i8*] [i8* @g2]
+@llvm.used = appending global [2 x i8*] [ i8* @g1, i8* @g3]
+@llvm.compiler.used = appending global [2 x i8*] [ i8* @g2, i8* @g4]
+
+; M1: !0 = !{i32 0, !"typeid"}
+!0 = !{i32 0, !"typeid"}