Index: lib/Passes/PassBuilder.cpp
===================================================================
--- lib/Passes/PassBuilder.cpp
+++ lib/Passes/PassBuilder.cpp
@@ -362,6 +362,10 @@
 
   invokePeepholeEPCallbacks(FPM, Level);
 
+  if (PGOOpt && !isOptimizingForSize(Level) &&
+      !PGOOpt->SampleProfileFile.empty())
+    FPM.addPass(PGOMemOPSizeOpt());
+
   FPM.addPass(TailCallElimPass());
   FPM.addPass(SimplifyCFGPass());