[mlir] Use llvm::hasSingleElement (NFC) (llvm#133881)

Author: CoTinker

mlir/lib/IR/Block.cpp

@@ -119,7 +119,7 @@ bool Block::verifyOpOrder() {
   if (!isOpOrderValid())
     return false;
   // The order is valid if there are less than 2 operations.
-  if (operations.empty() || std::next(operations.begin()) == operations.end())
+  if (operations.empty() || llvm::hasSingleElement(operations))
     return false;
 
   Operation *prev = nullptr;

mlir/lib/Transforms/Utils/InliningUtils.cpp

@@ -330,7 +330,7 @@ inlineRegionImpl(InlinerInterface &interface, Region *src, Block *inlineBlock,
   bool singleBlockFastPath = interface.allowSingleBlockOptimization(newBlocks);
 
   // Handle the case where only a single block was inlined.
-  if (singleBlockFastPath && std::next(newBlocks.begin()) == newBlocks.end()) {
+  if (singleBlockFastPath && llvm::hasSingleElement(newBlocks)) {
     // Run the result attribute handler on the terminator operands.
     Operation *firstBlockTerminator = firstNewBlock->getTerminator();
     builder.setInsertionPoint(firstBlockTerminator);