Index: llvm/lib/Passes/PassBuilder.cpp
===================================================================
--- llvm/lib/Passes/PassBuilder.cpp
+++ llvm/lib/Passes/PassBuilder.cpp
@@ -773,17 +773,6 @@
   if (EnableLoopInterchange)
     LPM2.addPass(LoopInterchangePass());
 
-  // Do not enable unrolling in PreLinkThinLTO phase during sample PGO
-  // because it changes IR to makes profile annotation in back compile
-  // inaccurate. The normal unroller doesn't pay attention to forced full unroll
-  // attributes so we need to make sure and allow the full unroll pass to pay
-  // attention to it.
-  if (Phase != ThinOrFullLTOPhase::ThinLTOPreLink || !PGOOpt ||
-      PGOOpt->Action != PGOOptions::SampleUse)
-    LPM2.addPass(LoopFullUnrollPass(Level.getSpeedupLevel(),
-                                    /* OnlyWhenForced= */ !PTO.LoopUnrolling,
-                                    PTO.ForgetAllSCEVInLoopUnroll));
-
   for (auto &C : LoopOptimizerEndEPCallbacks)
     C(LPM2, Level);