[Scalar] Use llvm::count (NFC) (#141445)

Author: kazutakahirata

llvm/lib/Transforms/Scalar/LoopInterchange.cpp

@@ -1524,11 +1524,8 @@ static void updateSuccessor(BranchInst *BI, BasicBlock *OldBB,
                             BasicBlock *NewBB,
                             std::vector<DominatorTree::UpdateType> &DTUpdates,
                             bool MustUpdateOnce = true) {
-  assert((!MustUpdateOnce ||
-          llvm::count_if(successors(BI),
-                         [OldBB](BasicBlock *BB) {
-                           return BB == OldBB;
-                         }) == 1) && "BI must jump to OldBB exactly once.");
+  assert((!MustUpdateOnce || llvm::count(successors(BI), OldBB) == 1) &&
+         "BI must jump to OldBB exactly once.");
   bool Changed = false;
   for (Use &Op : BI->operands())
     if (Op == OldBB) {