diff --git a/llvm/lib/Passes/PassBuilderPipelines.cpp b/llvm/lib/Passes/PassBuilderPipelines.cpp
--- a/llvm/lib/Passes/PassBuilderPipelines.cpp
+++ b/llvm/lib/Passes/PassBuilderPipelines.cpp
@@ -1735,6 +1735,10 @@
   if (EnableHotColdSplit)
     MPM.addPass(HotColdSplittingPass());
 
+  // Enable IR outlining late in the FullLTO post-link pipeline.
+  if (EnableIROutliner)
+    MPM.addPass(IROutlinerPass());
+
   // Add late LTO optimization passes.
   // Delete basic blocks, which optimization passes may have killed.
   MPM.addPass(createModuleToFunctionPassAdaptor(SimplifyCFGPass(