diff --git a/clang/lib/CodeGen/BackendUtil.cpp b/clang/lib/CodeGen/BackendUtil.cpp
index a125c96f..ba61a93 100644
--- a/clang/lib/CodeGen/BackendUtil.cpp
+++ b/clang/lib/CodeGen/BackendUtil.cpp
@@ -77,6 +77,7 @@
 #include "llvm/Transforms/Utils/EntryExitInstrumenter.h"
 #include "llvm/Transforms/Utils/NameAnonGlobals.h"
 #include "llvm/Transforms/Utils/SymbolRewriter.h"
+#include "llvm/Transforms/Utils/UniqueInternalLinkageNames.h"
 #include <memory>
 using namespace clang;
 using namespace llvm;
@@ -719,6 +720,12 @@
   if (!CodeGenOpts.RewriteMapFiles.empty())
     addSymbolRewriterPass(CodeGenOpts, &MPM);
 
+  // Add UniqueInternalLinkageNames Pass which renames internal linkage symbols
+  // with unique names.
+  if (CodeGenOpts.UniqueInternalLinkageNames) {
+    MPM.add(createUniqueInternalLinkageNamesPass());
+  }
+
   if (Optional<GCOVOptions> Options = getGCOVOptions(CodeGenOpts)) {
     MPM.add(createGCOVProfilerPass(*Options));
     if (CodeGenOpts.getDebugInfo() == codegenoptions::NoDebugInfo)
@@ -1203,6 +1210,12 @@
       if (LangOpts.Sanitize.has(SanitizerKind::LocalBounds))
         MPM.addPass(createModuleToFunctionPassAdaptor(BoundsCheckingPass()));
 
+      // Add UniqueInternalLinkageNames Pass which renames internal linkage
+      // symbols with unique names.
+      if (CodeGenOpts.UniqueInternalLinkageNames) {
+        MPM.addPass(UniqueInternalLinkageNamesPass());
+      }
+
       // Lastly, add semantically necessary passes for LTO.
       if (IsLTO || IsThinLTO) {
         MPM.addPass(CanonicalizeAliasesPass());
@@ -1292,6 +1305,12 @@
           MPM.addPass(InstrProfiling(*Options, false));
         });
 
+      // Add UniqueInternalLinkageNames Pass which renames internal linkage
+      // symbols with unique names.
+      if (CodeGenOpts.UniqueInternalLinkageNames) {
+        MPM.addPass(UniqueInternalLinkageNamesPass());
+      }
+
       if (IsThinLTO) {
         MPM = PB.buildThinLTOPreLinkDefaultPipeline(
             Level, CodeGenOpts.DebugPassManager);