[SLU][profcheck] Propagate profile for branches on injected conditions.

Author: mtrofin

llvm/lib/Transforms/Scalar/SimpleLoopUnswitch.cpp

@@ -3195,10 +3195,14 @@ injectPendingInvariantConditions(NonTrivialUnswitchCandidate Candidate, Loop &L,
   Builder.SetInsertPoint(TI);
   auto *InvariantBr =
       Builder.CreateCondBr(InjectedCond, InLoopSucc, CheckBlock);
+  // We don't know anything about the relation between the limits.
+  setExplicitlyUnknownBranchWeightsIfProfiled(
+      *InvariantBr, *InvariantBr->getParent()->getParent(), DEBUG_TYPE);
 
   Builder.SetInsertPoint(CheckBlock);
   Builder.CreateCondBr(TI->getCondition(), TI->getSuccessor(0),
-                       TI->getSuccessor(1));
+                       TI->getSuccessor(1),
+                       TI->getMetadata(LLVMContext::MD_prof));
   TI->eraseFromParent();
 
   // Fixup phis.