[NFC] Replace readonly SmallVectorImpl with ArrayRef

llvm-svn: 353273

llvm/include/llvm/Transforms/Utils/BasicBlockUtils.h

@@ -46,7 +46,7 @@ void DeleteDeadBlock(BasicBlock *BB, DomTreeUpdater *DTU = nullptr);
 /// no predecessors that are not being deleted themselves. \p BBs must have no
 /// duplicating blocks. If there are loops among this set of blocks, all
 /// relevant loop info updates should be done before this function is called.
-void DeleteDeadBlocks(SmallVectorImpl <BasicBlock *> &BBs,
+void DeleteDeadBlocks(ArrayRef <BasicBlock *> BBs,
                       DomTreeUpdater *DTU = nullptr);
 
 /// We know that BB has one predecessor. If there are any single-entry PHI nodes

llvm/lib/Transforms/Utils/BasicBlockUtils.cpp

@@ -48,11 +48,10 @@
 using namespace llvm;
 
 void llvm::DeleteDeadBlock(BasicBlock *BB, DomTreeUpdater *DTU) {
-  SmallVector<BasicBlock *, 1> BBs = {BB};
-  DeleteDeadBlocks(BBs, DTU);
+  DeleteDeadBlocks({BB}, DTU);
 }
 
-void llvm::DeleteDeadBlocks(SmallVectorImpl <BasicBlock *> &BBs,
+void llvm::DeleteDeadBlocks(ArrayRef <BasicBlock *> BBs,
                             DomTreeUpdater *DTU) {
 #ifndef NDEBUG
   // Make sure that all predecessors of each dead block is also dead.